Support for page action

[jszobody]

Right now this is only available as a table action. Would be nice to be available as a page action as well, so it could be added to a View User page, for example.

[jacksleight]

This would be really useful. It would also be nice to have the option to use a regular text button instead of an icon.

If anyone needs this immediately you can do this for now:

use STS\FilamentImpersonate\Impersonate;

class ViewUser extends ViewRecord
{
    // ...

    protected function getActions(): array
    {
        return array_merge([
            Pages\Actions\ButtonAction::make('impersonate')
                ->action(function () {
                    Impersonate::impersonate($this->record);
                }),
        ], parent::getActions());
    }
}

[josefbehr]

@jszobody I just added this in #27, please test, if you can