support passing certificate buffer

[shanghaikid]

relate #334

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.62%. Comparing base (0db18b2) to head (bfbb62c).

Files	Patch %	Lines
milvus/grpc/BaseClient.ts	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #336      +/-   ##
==========================================
- Coverage   96.72%   96.62%   -0.11%     
==========================================
  Files          43       43              
  Lines        2655     2663       +8     
  Branches      653      661       +8     
==========================================
+ Hits         2568     2573       +5     
- Misses         81       84       +3     
  Partials        6        6              

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