[4.0] Namespace com_tags

[joomdonation]

Pull Request for Issue # .

Summary of Changes

This PR converts com_tags component to namespace MVC for Joomla 4.

Testing Instructions

As the none namespace version has issues, the test is just makes sure it works as before:

1. Backend: Test and make sure add/edit/publish/unpublish.. works as expected.
2. Frontend: Currently, view detail tag of some tags in sample data broken (routing issue, I guess). So just view list of tags, view some tags work

Known issues

1. Routing to tag detail broken (for example Green tag in sample data)

2. Viewing rss feed has some notices:

• Notice: Undefined index: mime in E:\www\contact\libraries\joomla\document\feed.php on line 217
• Notice: Undefined variable: tz in E:\www\contact\libraries\joomla\document\renderer\feed\rss.php on 247
• Warning: DateTime::setTimezone() expects parameter 1 to be DateTimeZone, null given in E:\www\contact\libraries\joomla\date\date.php on line 408

[wilsonge]

Routing fixed with 3f4914b and #13600

[wilsonge]

RSS feed fixed with 813f69f

[joomdonation]

Great. I am good with testing, then :D