Feat: add support for Trino's authorization session property

[georgesittas]

This adds first-class support for Trino's SET SESSION AUTHORIZATION (docs), using the existing session_properties mapping. One can now do the following:

MODEL (
    name <model_name>,
    ...,
    session_properties (
        authorization = 'foo'
    )
);

which will result in the following statement:

SET SESSION AUTHORIZATION 'foo';

to be run before anything relevant to this model is executed, and then the following statement:

RESET SESSION AUTHORIZATION;

will run after all statements relevant to this model have been executed.