Refactor: Port this project into typescript

[samhwang]

What this is

During the initial planning phase, this project was planned to be using Python and the interactions.py library. However, due to a few hiccups with the libraries, esp. around interactions.py, we have lost a lot of morale in the project. Time was spent mostly on fixing the bugs with the tools and not creating a meaningful experience.

This is why I took the time to make a porting attempt of this project into TypeScript, using the bootstrapping template at samhwang/ts-starter-template and a similar structure to viet-aus-it/vait-discord-bot.

Why this PR was made

The decision was made on a few key points:

• The discord.js library is more actively maintained than interactions.py
• Documentations of discord.js is a lot more detailed in what we need to do in deploying guild-specific things vs global. This was severely lacking in interactions.py.
• Writing tests proved difficult because of the annotations syntax being used in the library itself.

Caveats

However, this decision also comes with caveats:

• Python is not removed completely from the project, as it is still used to run the LiteLLM Proxy. This might proven to be tricky to use devcontainers.
• In NodeJS, there isn't a native GDrive downloader like gdown, so I had to write up a module manually.

What was done

• Ported the project to TypeScript using the robust toolset:
  • vitest Test runner
  • tsup TypeScript Bundler
  • tsx CLI tool to run TypeScript files locally
  • biome Linter & Formatter
  • zod Schema validation
• An attempt was made to try to keep the same project structure, however, I took the liberty to make a few changes for clarity:
  • src/discord_bot is now split up into 3:
    • src/discord for discord related utilities
    • src/slash-commands for all slash commands
    • src/autocompletes for all autocompletes
  • All tests now live in the same folder with its main module. During building and bundling, these files will be skipped.

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I understand this PR maybe wieldy to look at in just the changed files. Please take a look at the branch as a whole.