This change introduces robust validation for Firestore document and
collection paths across various Firestore tools.
Key changes include:
* **Path Validation:** Ensures that all Firestore paths used in tools
are relative and adhere to correct formatting, preventing issues with
absolute paths or malformed segments.
* **Improved Parameter Descriptions:** Updates the descriptions for
Firestore tool parameters to clearly specify the expectation of relative
paths (e.g., `users/userId` or `users/userId/posts/postId`) instead of
absolute paths.
* **New Utility:** Adds `internal/tools/firestore/util/validator.go` and
its corresponding test file for path validation logic.
---------
Co-authored-by: prernakakkar-google <158031829+prernakakkar-google@users.noreply.github.com>
