Add changelog for v4.20.0

[dirkkul]

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[Copilot]

Pull request overview

This PR adds the changelog entry for version 4.20.0 and fixes import ordering for VectorIndexConfig classes to follow alphabetical conventions.

Changes:

• Added changelog entry for v4.20.0 documenting new features, improvements, and fixes
• Reordered imports alphabetically to place VectorIndexConfigHFresh before VectorIndexConfigHNSW across multiple files

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/changelog.rst	Added v4.20.0 changelog entry documenting new features including HFresh index type, SSB GA, async replication, and other improvements
weaviate/outputs/config.py	Reordered imports to place VectorIndexConfigHFresh before VectorIndexConfigHNSW alphabetically
weaviate/collections/config/sync.pyi	Reordered imports to place _VectorIndexConfigHFreshUpdate before _VectorIndexConfigHNSWUpdate alphabetically
weaviate/collections/config/executor.py	Reordered imports to place _VectorIndexConfigHFreshUpdate before _VectorIndexConfigHNSWUpdate alphabetically
weaviate/collections/config/async_.pyi	Reordered imports to place _VectorIndexConfigHFreshUpdate before _VectorIndexConfigHNSWUpdate alphabetically
weaviate/collections/classes/config_vectors.py	Reordered imports to place _VectorIndexConfigHFreshCreate/Update before _VectorIndexConfigHNSWCreate/Update alphabetically
weaviate/collections/classes/config_named_vectors.py	Reordered imports to place _VectorIndexConfigHFreshUpdate before _VectorIndexConfigHNSWUpdate alphabetically
weaviate/collections/classes/config_methods.py	Reordered imports to place _VectorIndexConfigHFresh before _VectorIndexConfigHNSW alphabetically
weaviate/collections/classes/config.py	Reordered imports to place _VectorIndexConfigHFreshUpdate before _VectorIndexConfigHNSWUpdate alphabetically

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.84%. Comparing base (fd58638) to head (ccf4f61).
⚠️ Report is 200 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1960      +/-   ##
==========================================
+ Coverage   86.45%   87.84%   +1.39%     
==========================================
  Files         274      280       +6     
  Lines       19966    21347    +1381     
==========================================
+ Hits        17261    18752    +1491     
+ Misses       2705     2595     -110     

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