feat:add admin http handler.

[SkyeBeFreeman]

PR Type

Describe what this PR does for and how you did.

Adding the issue link (#xxx) if possible.

Note

Checklist

• [ ] Add information of this PR to CHANGELOG.md in root of project.
• [ ] Add documentation in javadoc or comment below the PR if necessary.

Checklist (Optional)

• [x] Will pull request to branch of 2023.
• [x] Will pull request to branch of 2022.
• [x] Will pull request to branch of 2021.
• [ ] Will pull request to branch of 2020.
• [ ] Will pull request to branch of hoxton.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 46.78899% with 58 lines in your changes missing coverage. Please review.

Project coverage is 69.87%. Comparing base (5aaf5b6) to head (e85e2b9). Report is 1 commits behind head on 2021.

Files with missing lines	Patch %	Lines
...config/extend/tsf/TsfInstanceMetadataProvider.java	32.00%	8 Missing and 9 partials :warning:
...config/PolarisContextEnvironmentPostProcessor.java	51.72%	7 Missing and 7 partials :warning:
...ris/context/config/extend/tsf/TsfContextUtils.java	0.00%	12 Missing :warning:
...ig/extend/tsf/TsfCoreEnvironmentPostProcessor.java	0.00%	7 Missing :warning:
...loud/common/tsf/ConditionalOnTsfConsulEnabled.java	25.00%	3 Missing :warning:
.../polaris/context/admin/PolarisAdminProperties.java	70.00%	3 Missing :warning:
...enhancement/stat/config/PolarisStatProperties.java	60.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2021 #1449 +/- ## ============================================ + Coverage 69.22% 69.87% +0.65% Complexity 2 2 ============================================ Files 309 312 +3 Lines 7353 7396 +43 Branches 876 891 +15 ============================================ + Hits 5090 5168 +78 + Misses 1826 1770 -56 - Partials 437 458 +21 ```

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