[BUGFIX] mssql: Identifier quoting and return types

Microsoft sql server field & columns quotes quotes identifiers as
[anIdentifier] in comparison to mysql and postgres which quote
with a character that is identical left and right.
The patch adapts some quoting methods to cope with that and
adapts a return type hint where the mssql doctrine driver returns
more precise value types than other platform drivers.

Change-Id: I8db6109d5a92ff43f3503f245c5d131b96201096
Resolves: #79297
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53115


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>