feat(gRPC): support dump MaxConcurrentStreams of HTTP2 Client

[DMwangnima]

What type of PR is this?

feat

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feat(gRPC): 支持查看 HTTP2 Client 的最大并发流数量

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Client 在创建 Stream 时受 HTTP2 Settings MaxConcurrentStreams 制约，若当前连接上的并发流超过这个限制，则 NewStream 会被阻塞。
支持查看当前状态的 MaxConcurrentStreams 以更好地排查问题。

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[codecov]

Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.21%. Comparing base (ca63109) to head (6c25edd).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/remote/trans/nphttp2/grpc/http2_client.go	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1820      +/-   ##
==========================================
- Coverage   60.26%   60.21%   -0.06%     
==========================================
  Files         381      381              
  Lines       34447    34463      +16     
==========================================
- Hits        20759    20751       -8     
- Misses      12427    12449      +22     
- Partials     1261     1263       +2     

Flag	Coverage Δ
integration	48.57% <0.00%> (-0.03%)	⬇️
unit	50.75% <92.59%> (-0.02%)	⬇️

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