chore: create .gitattributes for consistent EOL handling

[lumirlumir]

This pull request includes changes to ensure consistent end-of-line (EOL) settings across text files and updates to the sync-client configuration to include the .gitattributes file.

Changes to EOL settings:

• .gitattributes: Added configuration to ensure consistent EOL (LF) for all text files.

Updates to sync-client configuration:

• .github/sync-client.yml: Added .gitattributes to the list of files to be synchronized.

[github-actions]

Labels have been automatically applied based on the conventional commit types.🏷️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.48%. Comparing base (5d56393) to head (906be77).
Report is 1 commits behind head on main.

@@           Coverage Diff           @@
##             main     #120   +/-   ##
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  Coverage   98.48%   98.48%           
=======================================
  Files           4        4           
  Lines          66       66           
=======================================
  Hits           65       65           
  Misses          1        1           

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