fix: consistency_level to return human-readable string

[veeceey]

Fixes #2985

Summary

When calling describe_collection(), the consistency_level field was returning a numeric value (0, 1, 2, 3, 4) instead of a human-readable string ("Strong", "Session", "Bounded", "Eventually", "Customized").

This made the output not user-friendly and required users to manually map the integer to its semantic meaning.

Changes

• Added _consistency_level_to_str() helper method to CollectionSchema class
• Maps ConsistencyLevel enum integers to their string names
• Falls back to returning the int if an unknown value is encountered
• Updated dict() method to use the helper when building the response

Before

{
  'collection_name': 'client_geometry_3yiyc8Bb',
  'consistency_level': 0,  # Not user-friendly!
  ...
}

After

{
  'collection_name': 'client_geometry_3yiyc8Bb', 
  'consistency_level': 'Strong',  # Human-readable!
  ...
}

Test Plan

The fix converts all consistency level enum values correctly:

• 0 → "Strong"
• 1 → "Session"
• 2 → "Bounded"
• 3 → "Eventually"
• 4 → "Customized"

Existing tests in tests/grpc_handler/test_collection.py verify describe_collection() functionality and will validate this change.

[sre-ci-robot]

Welcome @veeceey! It looks like this is your first PR to milvus-io/pymilvus 🎉

[veeceey]

/assign @longjiquan

[sre-ci-robot]

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[veeceey]

Hi @longjiquan, friendly ping on this PR. It's been open for about 10 days and is awaiting your review/approval. Would appreciate any feedback when you have a moment. Thank you!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.21%. Comparing base (4297335) to head (9cb3025).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3267   +/-   ##
=======================================
  Coverage   76.21%   76.21%           
=======================================
  Files          63       63           
  Lines       13292    13296    +4     
=======================================
+ Hits        10130    10134    +4     
  Misses       3162     3162           

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[XuanYang-cn]

@veeceey Please fix the code checker

[veeceey]

On it @XuanYang-cn — looking into the code checker failure now and will push a fix.

[veeceey]

Fixed -- rebased to add the DCO sign-off that was missing on the second commit. Should be green now.