[FR] Master issue for Code Block improvements

### Description

Improvements:
- [ ] Enable hide line numbers
- [ ] Show the language that is guessed by the "Auto" option
- [ ] Allow changing the indentation level
- [ ] Bracket completion
- [ ] Collapse code block
- [ ] Auto indentation improvement after opening brakcet

### Impact

More control over the behavior of the code block depending on the usage and language.

### Additional Context

Code block is over at https://github.com/AppFlowy-IO/AppFlowy-plugins

Much of the implementations can be done in the main repository, but there is a need for some enablers in the plugins repository.