feat: AOC Leaderboard commands

[samhwang]

• feat: add aoc key and leaderboard id field
• feat: add command to set aoc settings
• feat: create function to fetch AOC data
• feat: add util functions to get and save leaderboard
• feat: add command to fetch leaderboard
• feat: add db migration for aoc models and settings

Description

• Add a command for admins to set aoc settings (leaderboard ID & session key)
• Add a command for everyone to get aoc results.

Motivation and Context

Advent of Code is a common activity that VAIT members are participating in for the third year in a row now. Getting this into the server will be an easy way to keep track of the leaderboard.

Related Issue

#243

How Has This Been Tested?

• Unit tests have all been ran
• Ran a test in the test server, see screenshots below.

Screenshots (if appropriate):

The first one is a fresh request, the second one is a repeated request and it will only show the cached one.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[hp0210]

Thank you!