[TASK] Ensure consistent handling of BLOBs

Set PDO attributes to ensure that BLOB fields are returned as strings to PHP,
the way MySQL does. Update INSERT/UPDATE statements that deal with BLOB field
to declare the proper parameter type so that the driver can do the required
encoding/escaping when sending the data to the DBMS.

Releases: master
Resolves: #78884
Change-Id: I1618da9130549bd95ce0410420ecdee40cc3632d
Reviewed-on: https://review.typo3.org/50883


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Manuel Selbach <manuel_selbach@yahoo.de>
Tested-by: Manuel Selbach <manuel_selbach@yahoo.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>