WIP: refactor: use bufiox interface in gRPC

[ppzqh]

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refactor

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[codecov]

Codecov Report

Attention: Patch coverage is 43.80165% with 68 lines in your changes missing coverage. Please review.

Project coverage is 59.93%. Comparing base (b36d010) to head (d8f2042).

Files with missing lines	Patch %	Lines
internal/mocks/bufiox/bufreader.go	0.00%	57 Missing ⚠️
pkg/remote/trans/nphttp2/grpc/framer.go	92.10%	2 Missing and 1 partial ⚠️
...emote/trans/nphttp2/grpc/grpcframe/frame_parser.go	25.00%	3 Missing ⚠️
pkg/remote/trans/nphttp2/server_handler.go	82.35%	2 Missing and 1 partial ⚠️
internal/mocks/conn.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1789      +/-   ##
===========================================
- Coverage    59.94%   59.93%   -0.01%     
===========================================
  Files          381      382       +1     
  Lines        34660    34760     +100     
===========================================
+ Hits         20778    20835      +57     
- Misses       12621    12665      +44     
+ Partials      1261     1260       -1     

Flag	Coverage Δ
integration	48.12% <50.00%> (-0.01%)	⬇️
unit	50.38% <39.66%> (+0.02%)	⬆️

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