feat(persistence): add support for DraftMessages

[xsahil03x]

Resolves: FLU-109

Description of the pull request

This pull request introduces support for draft messages in the stream_chat_persistence.

[github-actions]

⚠️ Database Entity Files Modified

The following database entity files have been modified in this PR:

packages/stream_chat_persistence/lib/src/entity/draft_messages.dart
packages/stream_chat_persistence/lib/src/entity/entity.dart
packages/stream_chat_persistence/lib/src/entity/messages.dart

📝 Remember to:

1. Update database version in db/drift_chat_database.dart.
2. Update entity schema tests if necessary.

Note: This comment is automatically generated by the CI workflow.

[codecov]

Codecov Report

Attention: Patch coverage is 97.65625% with 3 lines in your changes missing coverage. Please review.

Project coverage is 62.45%. Comparing base (239ad76) to head (f5c65ce).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...hat_persistence/lib/src/dao/draft_message_dao.dart	94.44%	2 Missing ⚠️
...ream_chat_persistence/lib/src/dao/message_dao.dart	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2219      +/-   ##
==========================================
+ Coverage   62.30%   62.45%   +0.15%     
==========================================
  Files         392      394       +2     
  Lines       24670    24776     +106     
==========================================
+ Hits        15370    15474     +104     
- Misses       9300     9302       +2     

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