[TASK] Use native idn functionality

It is safe to use idn_to_ascii() these days
due to symfony's polyfill functionality.

This allows us to remove the dependency
"algo26-matthias/idna-convert".

Also, all other places now use the native
idn_to_ascii() call, which could speed up
performance.

The wrapper call GeneralUtility::idnaEncode()
can then safely be deprecated.

used composer command:
  composer remove algo26-matthias/idna-convert

Resolves: #87894
Releases: master
Change-Id: I85aa6f39b8ff5ac171cd73218ed1144a56d9f724
Reviewed-on: https://review.typo3.org/c/60234


Reviewed-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Stephan Großberndt <stephan.grossberndt@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>