feat: list profiles in json or table format

[mdelapenya]

What does this PR do?

It exposes a new flag to set the format when listing existing profiles. The supported formats are table and json, being table the default one.

$ go run main.go profiles list --help
2021/10/06 06:14:55  WARN CommitHash is undefined, in both /Users/mdelapenya/.elastic-package/version and the compiled binary, config may be out of date.
List available profiles

Usage:
  elastic-package profiles list [flags]

Flags:
      --format string   format of the profiles list (table | json) (default "table")
  -h, --help            help for list

Global Flags:
  -v, --verbose   verbose mode

Why is it important?

We'd like the tool to provide the existing profiles in a machine-readable format, as we want to check if there is a profile. Yes, we could directly check the filesystem, but this is more consistent :)

How to test this locally

Run the tool in table format:

$ go run main.go profiles list
2021/10/06 06:07:47  WARN CommitHash is undefined, in both /Users/mdelapenya/.elastic-package/version and the compiled binary, config may be out of date.
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+
|             NAME             |       DATE CREATED        |    USER    |  VERSION  |                                   PATH                                   |
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+
| custom-pr                    | 2021-10-04T18:02:48+02:00 | mdelapenya | 1af18c9   | /Users/mdelapenya/.elastic-package/profiles/custom-pr                    |
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+
| default                      | 2021-10-06T06:01:26+02:00 | mdelapenya | undefined | /Users/mdelapenya/.elastic-package/profiles/default                      |
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+
| default_1af18c9_1629958780   | 2021-08-26T08:19:40+02:00 | mdelapenya | 1af18c9   | /Users/mdelapenya/.elastic-package/profiles/default_1af18c9_1629958780   |
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+
| default_undefined_1633422611 | 2021-10-05T10:30:11+02:00 | mdelapenya | undefined | /Users/mdelapenya/.elastic-package/profiles/default_undefined_1633422611 |
+------------------------------+---------------------------+------------+-----------+--------------------------------------------------------------------------+

Run the tool in JSON format:

$ go run main.go profiles list --format json
2021/10/06 06:07:47  WARN CommitHash is undefined, in both /Users/mdelapenya/.elastic-package/version and the compiled binary, config may be out of date.
[{"name":"custom-pr","date_created":"2021-10-04T18:02:48.167182+02:00","user":"mdelapenya","version":"1af18c9","path":"/Users/mdelapenya/.elastic-package/profiles/custom-pr"},{"name":"default","date_created":"2021-10-06T06:01:26.74122+02:00","user":"mdelapenya","version":"undefined","path":"/Users/mdelapenya/.elastic-package/profiles/default"},{"name":"default_1af18c9_1629958780","date_created":"2021-08-26T08:19:40.39341+02:00","user":"mdelapenya","version":"1af18c9","path":"/Users/mdelapenya/.elastic-package/profiles/default_1af18c9_1629958780"},{"name":"default_undefined_1633422611","date_created":"2021-10-05T10:30:11.968095+02:00","user":"mdelapenya","version":"undefined","path":"/Users/mdelapenya/.elastic-package/profiles/default_undefined_1633422611"}]

Run the tool with a non-supported format:

$ go run main.go profiles list --format FOO
2021/10/06 06:12:07  WARN CommitHash is undefined, in both /Users/mdelapenya/.elastic-package/version and the compiled binary, config may be out of date.
Error: format FOO not supported
exit status 1

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[mtojek]

Only few nit-picks, but I suppose you're good to go.

[mdelapenya]

Only few nit-picks, but I suppose you're good to go.

Resolved in follow-up commits. Thanks for the review!!