Backport of Exported services CLI and docs into release/1.17.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #20331 to be assessed for backporting due to the inclusion of the label backport/1.17.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@tauhid621
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "33154cde48155396bf74f38d6a935b547f42c568", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

---

Description

This PR adds a new cli command to list exported services

command: consul services exported-services

The PR also adds the API docs for the exported services API.

CLI output
CE

$ ./bin/consul services exported-services                          
Service   Consumer Peers
backend   east, west
db        west
frontend  east, east-eu
web       east

Enterprise

$ ./bin/consul services exported-services                          
Service   Partition  Namespace  Consumer Peers  Consumer Partitions
backend   default    default    east, west      
db        default    default    west            partition-west
frontend  default    default    east, east-eu   
frontend  default    ns         east, east-eu   
web       default    default    east 

CLI output json

$ ./bin/consul services exported-services -format=json
[
    {
        "Service": "backend",
        "Consumers": {
            "Peers": [
                "east",
                "west"
            ]
        }
    },
    {
        "Service": "db",
        "Consumers": {
            "Peers": [
                "west"
            ]
        }
    },
    {
        "Service": "frontend",
        "Consumers": {
            "Peers": [
                "east",
                "east-eu"
            ]
        }
    },
    {
        "Service": "web",
        "Consumers": {
            "Peers": [
                "east"
            ]
        }
    }
]

Testing & Reproduction steps

• Tests added
• Manual testing

Links

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

---

Overview of commits

• 53c499b - 92c7e4e - 3aa9612 - 4e65f12 - 2070d61 - 292b245 - 33154cd - e9e81ef

[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR

[tauhid621]

Manual backport: #20494