feat(client): add MinHash deduplication methods to MilvusClient

[zhuwenxing]

Summary

• Add self_deduplicate() method to deduplicate documents within a collection based on MinHash similarity
• Add deduplicate() method to check new documents against existing collection for duplicates
• Add helper method _get_minhash_fields() to extract MinHash function field names

Both methods require the collection to have a MinHash function configured.

Test plan

• Unit tests for _get_minhash_fields() helper method
• Unit tests for self_deduplicate() with mock data
• Unit tests for deduplicate() with mock data
• Integration test with actual Milvus instance

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

❌ Patch coverage is 3.94737% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.91%. Comparing base (2a2e898) to head (b3576bc).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pymilvus/milvus_client/milvus_client.py	3.94%	73 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3257      +/-   ##
==========================================
- Coverage   76.32%   75.91%   -0.42%     
==========================================
  Files          63       63              
  Lines       13230    13306      +76     
==========================================
+ Hits        10098    10101       +3     
- Misses       3132     3205      +73     

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[zhuwenxing]

/hold