dx fmt eats block comments

**Problem**

Currently we have no special handling for block comments in rsx. Only `//` and `///` are supported.

Block comments are particularly tricky since you need to identify the *end* of the block comment which means we now need a block comment parser. This isn't *too* terrible to actually implement but is not that important for the time being.

**Environment:**
- Dioxus version:
- Rust version:
- OS info:
- App platform:

**Questionnaire**

- [ ] I'm interested in fixing this myself but don't know where to start
- [ ] I would like to fix and I have a solution
- [ ] I don't have time to fix this right now, but maybe later