support alter collection

[shanghaikid]

this pr add an alterCollecition function.
fix #241

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[codecov]

Codecov Report

Merging #248 (a330217) into main (aae9936) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head a330217 differs from pull request most recent head 93c8bc2. Consider uploading reports for the commit 93c8bc2 to get more accurate results

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
+ Coverage   95.71%   95.72%   +0.01%     
==========================================
  Files          33       33              
  Lines        1656     1661       +5     
  Branches      406      407       +1     
==========================================
+ Hits         1585     1590       +5     
  Misses         68       68              
  Partials        3        3              

Files	Coverage Δ
milvus/grpc/Collection.ts	98.82% <100.00%> (+0.03%)	⬆️

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