Add haml as preprocessor

[chmich]

Is your feature request related to a problem? Please describe.
There is a nice and frequently used haml processor: hamljs
The reason for preferring it over pug is: On Rails Backend, like many, i work with haml. Then backend and frontend could have the same language.

I tried to implement it, but: Internal server error: Error while preprocessing /Users/dev/temp/vite-app/app/frontend/javascript/components/hello.svelte - Cannot find module './transformers/hamljs' (same with 'haml' instead of 'hamljs')

Describe the solution you'd like
Add it as option for preprocessing.

Describe alternatives you've considered
:)

How important is this feature to you?
not serious, but would be nice.

Additional context
thats all.

Thanks,
Christian