chore: Add clang format check to CI

[tustanivsky]

This PR introduces automatic code formatting checks to the project by:

• Adding a .clang-format configuration file
• Adding a new CI workflow that checks for formatting issues
• Applying formatting fixes across the entire plugin codebase to comply with the new style rules

#skip-changelog

[limbonaut]

Looks good! A simple approach with find | clang-format -- I like it.