Make table groups collapsible by default

[TheGodlyLuzer]

This would be a super useful feature, for those, who display lots of data and want the collapsed groups shown, when rendering the UI.

maybe something like this:

    public static function table(Table $table): Table
    {
        return $table->groups([
                Group::make('year')
                    ->label('Jahr')
                    ->collapsible()
                    ->collapsed(), //This
            ])
            ->defaultGroup('year')
}