[5.2][Events] Use event classes for Authentication plugins

[Fedik]

Summary of Changes

Update authentication and api-authentication plugins to use SubscriberInterface and an event classes.

Testing Instructions

Login/Logout,
do API request.

All should work as before.

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: New Event classes Manual#177
• No documentation changes for manual.joomla.org needed

[LadySolveig]

I have tested this item ✅ successfully on 9825e5a

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[exlemor]

I have tested this item ✅ successfully on 9825e5a

Hi, thanks to @LadySolveig, and @bembelimen, I was able to successfully test this.

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[richard67]

RTC

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[Hackwar]

Thank you for your contribution @Fedik!