grpc: make client report Internal status when server response contains unsupported encoding

[Gayathri625]

fixes: #6987
According to the compression test case 5, the client should report Internal error status when the the server response contains unsupported encoding. But we are getting Unimplemented error status as there is no condition written for this case in checkRecvPayload function.
Hence adding a parameter to know whether this function is being called from the client side or from the server side.
If the function is called by client and server response has unsupported encoding, then return Internal error status, if called by server and client request contains unsupported encoding, then return Unimplemented.

RELEASE NOTES:

• Clients now return status code INTERNAL instead of UNIMPLEMENTED when the server uses an unsupported compressor. This is consistent with the gRPC compression spec.

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.40%. Comparing base (1b1230b) to head (0bc8326).
Report is 6 commits behind head on master.

Files	Patch %	Lines
rpc_util.go	62.50%	1 Missing and 2 partials ⚠️
stream.go	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7461      +/-   ##
==========================================
+ Coverage   81.35%   81.40%   +0.05%     
==========================================
  Files         354      357       +3     
  Lines       27080    27242     +162     
==========================================
+ Hits        22031    22177     +146     
- Misses       3837     3849      +12     
- Partials     1212     1216       +4     

Files	Coverage Δ
server.go	82.45% <100.00%> (-0.50%)	⬇️
stream.go	81.49% <60.00%> (-0.33%)	⬇️
rpc_util.go	82.14% <62.50%> (+0.50%)	⬆️

... and 26 files with indirect coverage changes

[Gayathri625]

@arjan-bal I see that in some tests inside compressor_test.go we are using nopCompressor which is also a wrapper for gzip. Therefore, I’m removing the previously defined mock compressor and using nopCompressor instead.

I am registering compressors on server side when serverUseNop is true using RPCCompressor and RPCDecompressor. sopts = append(sopts, grpc.RPCCompressor(newNopCompressor()), grpc.RPCDecompressor(newNopDecompressor()))
and registering compressors on client side when clientUseNop is true using RPCCompressor and RPCDecompressor. dOpts = append(dOpts, grpc.WithCompressor(newNopCompressor()), grpc.WithDecompressor(newNopDecompressor()))

The reason for using the deprecated RPCCompressor() and WithCompressor().. methods is that they allow me to register compressors selectively, limiting their usage to either the client or server based on the serverUseNop and clientUseNop fields.
When I use encoding.registerCompressor(), the compressor is applied globally, affecting both the client and server.

[arjan-bal]

LGTM, assigning a second reviewer.

[Gayathri625]

@easwars I have addressed the comments, please review it again

[easwars]

Looks good mostly. Just very minor comments this time around.