Add cli command to view onboarding status of participants

[amrit110]

This pull request introduces an admin-only onboarding status report feature to the CLI tool, allowing administrators to view the onboarding status of all participants in a formatted table. It also adds supporting utility functions, a new dependency, and minor CLI usability improvements.

Admin onboarding status report feature:

• Added a new --admin-status-report CLI flag that, when used, displays a table summarizing onboarding status for all participants, including completion rates, using Firestore admin credentials. [1] [2]
• Implemented the display_onboarding_status_report function in cli.py to fetch and present this data, with clear error handling and summary.

Supporting utilities:

• Added initialize_firestore_admin and get_all_participants_with_status utility functions to utils.py for securely connecting to Firestore with admin credentials and retrieving participant data.

Dependency and import updates:

• Added pandas as a dependency in pyproject.toml (though not yet used in this PR), and imported rich.table.Table for improved CLI table rendering. [1] [2]

CLI usability improvements:

• Made --bootcamp-name and --test-script arguments optional by default, but enforced them as required for participant onboarding (not for admin report mode), improving flexibility and error messages. [1] [2] [3]

Version bump:

• Updated the project version from 0.3.2 to 0.3.3 in pyproject.toml.