[Backport] Allow configuring min and max dates for date picker component

[rogyar]

Original PR: #14552

Description

Currently it is not possible to pass over the min and max dates for the datepicker component. This issue is fixed in this PR.

e.g. after this the date field can be used like this:

       $fieldset->addField(
            'my_date',
            'date',
            [
                'name' => 'my_date',
                'label' => __('Date'),
                'title' => __('Date'),
                'format' => 'yyyy-mm-dd',
                'min_date' => (new DateTimeImmutable('today+1 day'))->format('Y-m-d'),
                'max_date' => (new DateTimeImmutable('today+1 week'))->format('Y-m-d'),
                'required' => true
            ]
        );

[magento-engcom-team]

Hi @rogyar. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.1.15 release.