Add IntBool ORM decorator (ORM PR 2)

[MaximeBICMTL]

Builds on #1303

Description

In the LORIS SQL schema, many boolean fields are actually represented as TINYINT(1) instead of BOOL. Until now, the LORIS-MRI Python ORM used these as BOOL fields, which is compatible with TINYINT(1) in MariaDB and MySQL. This PR improves the preciseness of the ORM by adding a decorator to accurately represent these "boolean integers" as integers in the SQL side, and booleans in the Python side.

Changelog

• Add a IntBool ORM decorator.
• Remove the special case in integration tests that handles boolean integers.
• Update the ORM models with the new decorator.

[jeffersoncasimir]

Approved!