[FC-0099] feat: enhance enforcement command

[BryanttV]

Description

This PR enhances the enforcement command to allow it to be used in two different ways:

1. Database mode (default): Uses AuthzEnforcer with policies from the database.
2. File mode: Uses a custom Casbin enforcer with policies and model from files. Activated when --policy-file-path or -p and --model-file-path or -m are provided, and reads policies directly from the specified file.

How to Test

Using Tutor:

1. Install this plugin with the changes in this PR.
2. Run the migrations by running tutor dev exec lms python manage.py lms migrate
3. Load the default policies by running tutor dev exec lms python manage.py lms load_policies

Example usage

Use policies from the database with the default model and AuthzEnforcer:

python manage.py lms enforcement

Use custom model and policy files with default Casbin Enforcer:

python manage.py lms enforcement -m /path/to/model.conf -p /path/to/policy.csv

Example test input

Database mode

File mode

Merge Checklist

Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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[mariajgrimaldi]

I'll merge this once you update the unreleased changelog :)

[BryanttV]

@mariajgrimaldi, unreleased changelog updated!