Split scss/input styles (extract components)

[joneff]

Currently, the styles for floating label are inside scss/input files and should be extracted in their separate module. The module should also be included as a dependency in the related components.

On a related note: k-fieldset styles are also in scss/input and should probably be moved to scss/forms.

Finally, looking at scss/forms, I am seeing styles for bootstrap forms. Those must definitely be extracted to a separate module. Material, per se, is not compatible with Bootstrap and the bootstrap-forms module will not be present there. At the very least, for v5 of the themes, we may consider re-evaluating our integration with Bootstrap.

[joneff]

Minus the bootstrap forms, the rest is done