Adding 3 new API endpoints to make easy to get the list of catalogs

[erdoganfurkan]

No description provided.

[brenard-irap]

I think the error reported by MyPy, which is causing the tests to fail, is due to the fact that the type of "rooms" is not sufficiently specified.

The following errors are reported:

src/cocat/app/app.py:164: error: "Column[Any]" has no attribute "__iter__"; maybe "__str__"? (not iterable)  [attr-defined]
src/cocat/app/app.py:189: error: "Column[Any]" has no attribute "__iter__"; maybe "__str__"? (not iterable)  [attr-defined]

This occurs when iterating over the SQLAlchemy JSON column "user.rooms".

Since Column is not iterable, MyPy rightfully raises an error-even though at runtime the field contains a list (from JSON).

The fix (fix_type.patch) is to use SQLAlchemy 2.0's typing system with Mapped[...] and mapped_column(...), so that MyPy understands the actual Python type.

I tested it on my side and all the tests seem to pass with this patch.

What do you think, @jeandet?