Fullscreen Modal bootstrap 5

[ldavidsp]

Add new size.

 fullscreen
 fullscreen-sm-down
 fullscreen-md-down
 fullscreen-lg-down
 fullscreen-xl-down
 fullscreen-xxl-down

Angular: 13.3.0

ng-bootstrap: 12.0.1

Bootstrap: 5.1

[maxokorokov]

We should think for a proper API for this maybe, but you can workaround it by using modal options modalDialogClass and adding the modal-fullscreen-XXX class yourself → https://ng-bootstrap.github.io/#/components/modal/api#NgbModalOptions

The decision here is whether we need additional flags for fullscreen in the options object or this would do.
Something like fullscreen: 'sm' | 'md' | 'lg' | 'xl' | 'xxl' | true