medic: print policies as tables

[JAORMX]

This allows for printing policy definitions with a table output. This is meant to be
a little friendlier than the straight YAML output we used to give.

Note that this also removes the status flag from the policy get command, as we're leaning towards more simple commands and this just duplicates the functionality from the policy_status get command.

Sample:

$ medic policy get -i 1 -p github
+----+--------------------+----------+------------+---------+------------------------------+--------------+-----------------------------------------+
| ID |        NAME        | PROVIDER |   ENTITY   | CONTEXT |          RULE                | RULE PARAMS  |             RULE DEFINITION             |
+----+--------------------+----------+------------+---------+------------------------------+--------------+-----------------------------------------+
|  1 | acme-github-policy | github   | repository | github  | secret_scanning              |              | enabled: true                           |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | secret_push_protection       |              | enabled: true                           |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | branch_protection            | branch: main | allow_deletions: false                  |
|    |                    |          |            |         |                              |              | allow_force_pushes: false               |
|    |                    |          |            |         |                              |              | allow_fork_syncing: true                |
|    |                    |          |            |         |                              |              | required_linear_history: true           |
|    |                    |          |            |         |                              |              | required_pull_request_reviews:          |
|    |                    |          |            |         |                              |              |   dismiss_stale_reviews: true           |
|    |                    |          |            |         |                              |              |   require_code_owner_reviews: true      |
|    |                    |          |            |         |                              |              |   required_approving_review_count: 1    |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | github_actions_allowed       |              | allowed_actions: selected               |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | allowed_selected_actions     |              | github_owned_allowed: true              |
|    |                    |          |            |         |                              |              | patterns_allowed: []                    |
|    |                    |          |            |         |                              |              | verified_allowed: true                  |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | default_workflow_permissions |              | can_approve_pull_request_reviews: false |
|    |                    |          |            |         |                              |              | default_workflow_permissions: read      |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | codeql_enabled               |              | {}                                      |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | actions_check_pinned_tags    |              | {}                                      |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +            +         +------------------------------+--------------+-----------------------------------------+
|    |                    |          |            |         | dependabot_enabled           |              | {}                                      |
|    |                    |          |            |         |                              |              |                                         |
+    +                    +          +------------+         +------------------------------+--------------+-----------------------------------------+
|    |                    |          | artifact   |         | artifact_signature           | name: test   | is_bundle_verified: true                |
|    |                    |          |            |         |                              | tags:        | is_signed: true                         |
|    |                    |          |            |         |                              | - main       | is_verified: true                       |
|    |                    |          |            |         |                              |              |                                         |
+----+--------------------+----------+------------+---------+------------------------------+--------------+-----------------------------------------+

Related to #876