refactor: refactor data process code

[jac0626]

• Introduced TypeHandler strategy pattern to encapsulate type-specific logic in dedicated handlers
• Refactored entity_helper.py and search_result.py, eliminating extensive if/elif branches
• Added type_handlers module with scalar, vector, and complex handlers

also see #3134

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[codecov]

Codecov Report

❌ Patch coverage is 73.66120% with 241 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@7ac0d68). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pymilvus/client/entity_helper.py	30.95%	87 Missing ⚠️
pymilvus/client/search_result.py	70.90%	48 Missing ⚠️
pymilvus/client/type_handlers/scalar_handlers.py	79.42%	43 Missing ⚠️
pymilvus/client/type_handlers/complex_handlers.py	72.64%	32 Missing ⚠️
pymilvus/client/type_handlers/vector_handlers.py	86.62%	21 Missing ⚠️
pymilvus/client/types.py	27.27%	8 Missing ⚠️
pymilvus/client/type_handlers/base.py	94.28%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3135   +/-   ##
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  Coverage          ?   50.41%           
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  Files             ?       73           
  Lines             ?    14093           
  Branches          ?        0           
=========================================
  Hits              ?     7105           
  Misses            ?     6988           
  Partials          ?        0           

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