[feat](http) Support update and show config for recycler and meta-service

[wyxxxcat]

What problem does this PR solve?

• add show_config endpoint to MetaService HTTP API (including v1 path)
• refactor RecyclerService HTTP handlers and add show_config/update_config support
• expose recycler thread pool group accessor used by HTTP service
• add cloud regression test for update_config + show_config roundtrip
• add recycleServiceHttpAddress in cloud_p0 custom regression config

example:

curl "http://localhost:5678/MetaService/http/show_config?token=greedisgood9999&conf_key=compacted_rowset_retention_seconds"
{
"code": "OK",
"msg": "",
"result": [
[
"compacted_rowset_retention_seconds",
"int64_t",
"1080",
true
]
]
}
curl "http://localhost:5678/MetaService/http/update_config?configs=compacted_rowset_retention_seconds=108&token=greedisgood9999"
{
"code": "OK",
"msg": ""
}
curl "http://localhost:5678/MetaService/http/show_config?token=greedisgood9999&conf_key=compacted_rowset_retention_seconds"
{
"code": "OK",
"msg": "",
"result": [
[
"compacted_rowset_retention_seconds",
"int64_t",
"108",
true
]
]
}

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[Thearas]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[wyxxxcat]

run buildall

[wyxxxcat]

run buildall

[doris-robot]

Cloud UT Coverage Report

Increment line coverage 0.84% (2/237) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	78.81% (1796/2279)
Line Coverage	64.80% (32045/49451)
Region Coverage	65.47% (15984/24416)
Branch Coverage	55.97% (8502/15190)

[w41ter]

Please provide an example and share the output.

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.