feat(cache): add warnings when using sync methods with async-only Redis client#369

Shades-en wants to merge 1 commit intoredis:mainredis/redis-vl-python:mainfrom

Shades-en:improve-embeddingcache-asyncclient-bug-triageShades-en/redis-vl-python:improve-embeddingcache-asyncclient-bug-triageCopy head branch name to clipboard