[metasrv] refine grpc

[ariesdevil]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

• fix suggested changes in the previous PR ISSUE-3605: Replace arrow flight with gRPC #3606
• move grpc to the independent crate.

Changelog

• Improvement

Related Issues

None

Test Plan

Unit Tests

Stateless Tests

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[codecov-commenter]

Codecov Report

Merging #3717 (87c4ff4) into main (5f8947c) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff          @@
##            main   #3717   +/-   ##
=====================================
- Coverage     60%     59%   -1%     
=====================================
  Files        705     705           
  Lines      37925   37921    -4     
=====================================
- Hits       22766   22752   -14     
- Misses     15159   15169   +10     

Impacted Files	Coverage Δ
common/meta/grpc/src/grpc_client.rs	0% <ø> (ø)
common/meta/grpc/src/grpc_client_conf.rs	0% <ø> (ø)
metasrv/src/executor/action_handler.rs	91% <ø> (ø)
metasrv/src/executor/meta_handlers.rs	81% <ø> (ø)
query/src/common/meta/meta_client.rs	26% <ø> (ø)
query/src/configs/config_meta.rs	87% <ø> (ø)
metasrv/src/api/grpc/grpc_service.rs	92% <100%> (-1%)	⬇️
metasrv/src/meta_service/meta_service_impl.rs	92% <100%> (+<1%)	⬆️
query/src/common/mod.rs	70% <0%> (-15%)	⬇️
...pelines/transforms/transform_aggregator_partial.rs	86% <0%> (-2%)	⬇️
... and 7 more

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[drmingdrmer]

Hm... appreciating these rational crate path in this patch!

[drmingdrmer]

Why is it switched from async_trait to tonic?

[ariesdevil]

tonic::async_trait is just re-pub async_trait::async_trait, using tonic reduce a dep crate:)

[drmingdrmer]

make sense 🤔

[databend-bot]

Wait for another reviewer approval