[FEATURE] Add infix option for filenames used by FileWriter

Resolves: #85236
Releases: master
Change-Id: Iad1047b7a91adee4d0dcad766d5116bea27e34ce
Reviewed-on: https://review.typo3.org/57198


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jürgen Venne <venne@schaffrath-digital.de>
Tested-by: Jürgen Venne <venne@schaffrath-digital.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>