rgw: add wildcard "*" support for conditional read

rgw: add wildcard "*" support for conditional read

- Enhanced If-Match and If-None-Match headers to support the wildcard "*".
- Updated conditional read behavior:
  - If-Match: * now returns 200 instead of 412 when any object exists.
  - If-None-Match: * now returns 304 instead of 200 when any object exists.
  - If-Match: * + If-None-Match: * now returns 304 instead of 412.
- Aligns with AWS S3 expected functionality for improved efficiency.

Signed-off-by: sungjoon_koh <sungjoon_koh@linecorp.com>