Add person attributes for mode choice

[Hussein-Mahfouz]

Main changes include adding functions to mark individuals as students, passengers, and public transport subscribers, and updating the configuration to support these new attributes.

Key changes include:

New Functions for Attribute Processing:

• Added functions get_passengers, get_pt_subscription, and get_students to src/acbm/postprocessing/matsim.py to add person attributes: isStudent, isPassenger, hasPTsubscription, sex

Updates to the Main Script:

• Modified scripts/5_acbm_to_matsim_xml.py to include the new functions and process additional attributes like sex, student status, passenger status, and public transport subscription status, as well as vehicle ownership attributes CarAvailability, BicycleAvailability, hasLicense

Configuration Updates:

• Updated the Postprocessing class in src/acbm/config.py to include new configuration parameters: student_age_base, student_age_upper, modes_passenger, and pt_subscription_age.

[sgreenbury]

As discussed, we can merge this now to ensure these features are available from the pipeline when #71 is merged. Enabling config to specify additional columns for upstream outputs would be a good option relating to #78.