[6.2] Add Enum FormField

[Hackwar]

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

This adds a new FormField which populates its options from a PHP Enum.

Testing Instructions

Add the following enum in /administrator/components/com_content/src/Enum/StateType.php

<?php 
namespace Joomla\Component\Content\Administrator\Enum;
enum StateType: int
{
    case Published           = 1;
    case Archived              = 2;
}

Add the following in line 275 of /administrator/components/com_content/forms/article.xml

        <field name="teststatus" type="enum" enum="Joomla\Component\Content\Administrator\Enum\StateType"
               prefix="COM_CONTENT_ARTICLES_STATE_OPTION" label="COM_CONTENT_ARTICLES_STATE_OPTION_STATE_TYPE_LABEL"
               default="0">
            <option value="0">COM_CONTENT_ARTICLES_STATE_OPTION_NONE</option>
        </field>

Actual result BEFORE applying this Pull Request

The field doesn't exist.

Expected result AFTER applying this Pull Request

The new field is displayed with 3 entries.

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Reda-Muhamed]

I have tested this item ✅ successfully on b860c87

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[LadySolveig]

I have tested this item ✅ successfully on b860c87

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/48113.}

[QuyTon]

RTC

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[laoneo]

I would say, that this needs to be documented, or not?

[MacJoom]

Thank you!

[MacJoom]

Documentation PR is here: joomla/Manual#696