feat(git): add size limits for git operations

- Added MAX_CHERRY_PICK_PATCH_BYTES limit of 100MB for cherry-pick operations
- Added MAX_ACTION_CONTENT_BYTES limit of 100MB for commit action content
- Added MAX_COMMIT_MESSAGE_BYTES limit of 10MB for commit messages
- Added MAX_CHECK_REVISIONS limit of 10,000 for revision checks
- Added MAX_REBASE_COMMITS limit of 10,000 for rebase operations
- Added MAX_REBASE_PATCH_BYTES limit of 100MB for rebase patches
- Added MAX_RESOLUTION_CONTENT_BYTES limit of 100MB for merge conflict resolutions
- Added MAX_REVERT_PATCH_BYTES limit of 100MB for revert operations
- Return InvalidArgument error when size limits are exceeded with descriptive messages

branch/compare_branch.rs

@@ -7,6 +7,8 @@ impl GitBare {
         &self,
         request: CompareBranchRequest,
     ) -> GitResult<CompareBranchResponse> {
+        crate::sanitize::validate_ref_name(&request.source_branch)?;
+        crate::sanitize::validate_ref_name(&request.target_branch)?;
         let repo = self.gix_repo()?;
         let source_ref = format!("refs/heads/{}", request.source_branch);
         let target_ref = format!("refs/heads/{}", request.target_branch);