Move fragment code into separate module #80
Description
Currently whetstone always includes fragment dependency.
If used in 100% Compose apps, this dependency is unnecessary and generates unnecessary bloat inside our apps.
It would be nice if all fragment-related code would be moved to a separate module, similarly to the whetstone-compose.
I'm prepared to make a PR for this, if desired. This is potentially breaking, but we could make fragment support opt-out to ensure it does not break anything for the existing users.