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

commit/query.rs

@@ -83,6 +83,13 @@ impl GitBare {
         &self,
         request: CheckObjectsExistRequest,
     ) -> GitResult<CheckObjectsExistResponse> {
+        const MAX_CHECK_REVISIONS: usize = 10_000;
+        if request.revisions.len() > MAX_CHECK_REVISIONS {
+            return Err(crate::error::GitError::InvalidArgument(format!(
+                "too many revisions (max {MAX_CHECK_REVISIONS})"
+            )));
+        }
+
         let repo = self.gix_repo()?;
         let mut revisions = Vec::new();