[FR] please add a good search function

### Description

Hello, appflowy makes a good impression. However, I am missing a very important feature. There is no full text search across the entire database. At least I can't find a "search" in the program. It would be great if a good search function were built in.
Thank you very much

### Impact

i think all users would benefit from a search function

### Additional Context

_No response_