feat(python): create require approval decorator

[edwinkys]

Description

Fixes #12

This adds a require_approval() decorator to Phantasm. Instead of having 2 decorators as written in the issue, we only add a decorator with an optional argument with_parameters which defaults to true. Users can disable this to ignore approver-modified parameters when calling the function.

How Has This Been Tested?

• New and existing unit tests pass locally with my changes.
• I have added tests that prove my changes are working as expected.

I have tested this manually by:

1. Running the server and the dashboard.
2. Connecting the dashboard to the coordinator server.
3. Running the updated test_get_approval script in the Python client.

Checklist

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.