feat: add config field to set internal tls sni

[haorenfsa]

/cc @xiaofan-luan @jaime0815 @nish112022

part of #36864

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/cc @xiaofan-luan @jaime0815 @nish112022

part of #36864

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Codecov Report

Attention: Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.09%. Comparing base (4c623ce) to head (5966d42).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/util/mock/grpcclient.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #38124       +/-   ##
===========================================
+ Coverage   68.87%   81.09%   +12.22%     
===========================================
  Files         289     1370     +1081     
  Lines       25484   191119   +165635     
===========================================
+ Hits        17551   154992   +137441     
- Misses       7933    30646    +22713     
- Partials        0     5481     +5481     

Components	Coverage Δ
Client	73.67% <ø> (∅)
Core	68.87% <ø> (ø)
Go	83.23% <93.10%> (∅)

Files with missing lines	Coverage Δ
internal/distributed/datacoord/client/client.go	96.19% <100.00%> (ø)
internal/distributed/datanode/client/client.go	89.61% <100.00%> (ø)
internal/distributed/indexnode/client/client.go	85.43% <100.00%> (ø)
internal/distributed/proxy/client/client.go	93.52% <100.00%> (ø)
internal/distributed/querycoord/client/client.go	95.80% <100.00%> (ø)
internal/distributed/querynode/client/client.go	91.51% <100.00%> (ø)
internal/distributed/rootcoord/client/client.go	94.93% <100.00%> (ø)
internal/util/grpcclient/client.go	99.23% <100.00%> (ø)
pkg/util/paramtable/grpc_param.go	85.85% <100.00%> (ø)
internal/util/mock/grpcclient.go	58.24% <0.00%> (ø)

... and 1071 files with indirect coverage changes

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[jaime0815]

/lgtm

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