Group field added

[mertasan]

It works like KeyVal. However, the keys of the groups are not added to the form data names. Useful for grouping fields. In this way, special styles can be assigned to each group. In the next process, special permissions can be set for groups. With subsequent enhancements, only groups can be used in other form components.

Group items names do not have the "key" prefix of the group. This is the most important feature that distinguishes it from the other array fields.

For example, 2 different groups can be added and 2 fields in one of the groups and 3 fields in the other can be shown. In this way, we make the grid counts in the form more useful/simple.

Input::make('Full Name')->rules('required'),
Group::make('Group 1 (3 column)')->fields([
    Input::make('Address')->rules('required'),
    Input::make('Postcode')->rules('required'),
    Input::make('Country')->rules('required'),
]),
Group::make('Group 2 (2 column)')->fields([
    Input::make('Product Name')->rules('required'),
    Input::make('Brand')->rules('required'),
]),