[TASK] Adjust auto-created column length for MM tables

This change reduces the column length for `tablenames`
and `fieldname` for TCA based auto-creation to the max
possible length of 64.

This reduces the needed size for the auto-created primary
key and ensure a working index for instances using mysql
or mariadb server backends without increased maximum
innodb index key length.

Resolves: #101731
Related: #101425
Releases: main, 12.4
Change-Id: Iba40730687a7033ea2f43c0aa6049f9df1212683
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80672


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan B�rk <stefan@buerk.tech>
Tested-by: Stefan B�rk <stefan@buerk.tech>