pd control: add service-gc-safepoint command

[Oreoxmt]

What is changed, added or deleted? (Required)

Close #10690

service-gc-safepoint is introduced in tikv/pd#2797

~$ tiup ctl:v6.5.0 pd service-gc-safepoint
Starting component `ctl`: /home/.tiup/components/ctl/v6.5.0/ctl pd service-gc-safepoint
{
  "service_gc_safe_points": [
    {
      "service_id": "gc_worker",
      "expired_at": 9223372036854775807,
      "safe_point": 439923410637160448
    }
  ],
  "gc_safe_point": 0
}

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• overvenus
• shichun-0415

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[Oreoxmt]

/cc @overvenus @shichun-0415 @zhaoxinyu

[Oreoxmt]

/verify

[Oreoxmt]

/verify

[shichun-0415]

LGTM

[Oreoxmt]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 63eeaf2

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #13406.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #13407.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #13408.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #13410.

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/docs-cn#release-6.1 from head ti-chi-bot:cherry-pick-13311-to-release-6.1: the GitHub API request returns a 403 error: {"message":"You have exceeded a secondary rate limit and have been temporarily blocked from content creation. Please retry your request again later.","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#secondary-rate-limits"}

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #14201.