feat(proxy): add relay rpc

[ShadowySpirits]

No description provided.

[codecov]

Codecov Report

Merging #810 (5b5787f) into main (808bb55) will increase coverage by 0.96%.
The diff coverage is 10.63%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #810      +/-   ##
============================================
+ Coverage     55.62%   56.58%   +0.96%     
- Complexity     1229     1255      +26     
============================================
  Files           132      132              
  Lines          8407     8447      +40     
  Branches        773      773              
============================================
+ Hits           4676     4780     +104     
+ Misses         3326     3238      -88     
- Partials        405      429      +24     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	58.80% <ø> (+3.67%)	⬆️
RocketMQ Proxy	37.00% <0.00%> (-0.69%)	⬇️
RocketMQ Store	74.34% <83.33%> (ø)
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

Files	Coverage Δ
...omq/rocketmq/store/service/TransactionService.java	50.00% <100.00%> (ø)
...om/automq/rocketmq/store/util/FlatMessageUtil.java	83.33% <ø> (-6.67%)	⬇️
.../com/automq/rocketmq/store/util/SerializeUtil.java	92.94% <100.00%> (+0.17%)	⬆️
...va/com/automq/rocketmq/store/MessageStoreImpl.java	46.21% <0.00%> (ø)
...mq/rocketmq/proxy/grpc/client/GrpcProxyClient.java	0.00% <0.00%> (ø)
...m/automq/rocketmq/proxy/grpc/ProxyServiceImpl.java	0.00% <0.00%> (ø)

... and 17 files with indirect coverage changes