[FOLLOWUP][FEATURE] Doctrine: Implement SchemaMigrationService

Rename SchemaMigrator test case file, use proper namespace and change
table names in the functional tests to use an all lowercase table name
to fix test failures on Windows.

Change-Id: I30e2c5d03261a3fbcbce473ac02a134a7ba4ca4a
Resolves: #77643
Releases: master
Reviewed-on: https://review.typo3.org/49701


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>