Add button form field and is not clicked condition

Add button form field and is not clicked condition

* Add button form field

Close #3693

* Add public method to submit `Ui/Dialog`

* Support additional submit buttons in `Form/Builder/Dialog`

* Support `ButtonFormField` in AJAX forms

* Fix identifier of data processor in `ButtonFormField`

* Fix data processor for `ButtonFormField`

* Add condition for form builder buttons not being clicked

* Simplify button form field-related TypeScript code

Co-authored-by: Alexander Ebert <ebert@woltlab.com>
* Add missing semicolon

* Unify condition to checked if form field button has been clicked

Co-authored-by: Alexander Ebert <ebert@woltlab.com>