[TASK] Add unicode license file next to .tbl files

The folder containing the charset conversion table files
should have the unicode license.txt file.

The license file is from https://unicode.org/license.txt

Resolves: #103796
Releases: main, 12.4, 11.5
Change-Id: I2577fea6e1b5326cd45da622ec6fbbc563bc140a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84120


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>