fix: suppress clippy too_many_lines in event_handler expand

[morshedulmunna]

Description

Closes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Documentation update
• Refactor / Performance improvement
• Test addition / improvement
• CI / Build / Dependency change

Checklist

Failure to follow any of these rules is grounds for rejection.
All boxes must be checked before a PR can be merged.

Code Style

• My code follows existing patterns in the codebase
• I have NOT added unnecessary comments — code should be self-documenting. Comments are only allowed for non-obvious logic
• My functions are small and focused on a single responsibility
• All public APIs I introduced are documented (doc comments on types, methods, and public module exports)

Testing

• I have added tests that prove my fix is effective or my feature works
• New and existing tests pass (cargo test --workspace --all-features)

Quality

• I have run cargo fmt --all -- --check — formatting is correct
• I have run cargo clippy --workspace --all-targets --all-features -- -D warnings — no warnings
• I have read CONTRIBUTING.md
• I have updated documentation if needed
• I have added a changelog entry in RELEASE_NOTES.md if applicable

Additional Context