feat: support nested array

[SpadeA-Tang]

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[codecov]

Codecov Report

❌ Patch coverage is 98.20359% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.30%. Comparing base (a4b3b38) to head (c731fb3).

Files with missing lines	Patch %	Lines
pymilvus/orm/schema.py	96.77%	2 Missing ⚠️
pymilvus/client/field_data_extractors.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3785      +/-   ##
==========================================
+ Coverage   94.22%   94.30%   +0.08%     
==========================================
  Files          77       77              
  Lines       16204    16367     +163     
==========================================
+ Hits        15268    15435     +167     
+ Misses        936      932       -4     

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