feat: add json datatype for grpc protocol

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#4872

What's changed and what's your intention?

Add json datatype for grpc protocol

wait for #4893

Checklist

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

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[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 83.96%. Comparing base (702a55a) to head (e73b409).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4897      +/-   ##
==========================================
- Coverage   84.22%   83.96%   -0.26%     
==========================================
  Files        1137     1137              
  Lines      209134   209140       +6     
==========================================
- Hits       176141   175614     -527     
- Misses      32993    33526     +533     

[fengjiachun]

LGTM