feat: add json format output for http interface

[Kev1n8]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Closes #4764.

What's changed and what's your intention?

Some BI or visualization tools like PowerBI accepts json data from custom web apis.

As explained in #4764, it's better if the http service return a json format that is already supported by other products.

• Added JsonResponse.
• Placed relevant tests.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[Kev1n8]

The branch includes commits from my last PR. Not sure what the cause is.

[codecov]

Codecov Report

Attention: Patch coverage is 78.70370% with 23 lines in your changes missing coverage. Please review.

Project coverage is 84.22%. Comparing base (a283e13) to head (95842da).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4797      +/-   ##
==========================================
- Coverage   84.45%   84.22%   -0.24%     
==========================================
  Files        1120     1121       +1     
  Lines      204139   204520     +381     
==========================================
- Hits       172414   172251     -163     
- Misses      31725    32269     +544     

[sunng87]

I think it's because you created this branch from your last feature branch. If your previous branch has been merged, you can rebase to main to fix that

[Kev1n8]

I think it's because you created this branch from your last feature branch. If your previous branch has been merged, you can rebase to main to fix that

I thought so too. thx

[sunng87]

Almost LGTM. It would be nice if we can add a test case in tests-integration/tests/http.rs

[Kev1n8]

Added a test case. Let me know if anything else is needed.

[killme2008]

LGTM. Thanks a lot.

[shuiyisong]

LGTM

BTW: it would be nice to add more tests, such as affected_rows cases and select count(1) cases where the column name is not the schema column name.
Possible future works: add total_rows in metadata for queries.