Migrate to bun

[ditsuke]

Bun, a faster modern alternative to Node.JS just released its first stable version. Why we want to migrate:

• It's fast.
• Compatible with Node APIs: expected to "just work" by just switching out Node for Bun.
• Has its own, very fast web framework; we can switch from Fastify as a second stage of the migration.
• Can transpile TS to JS on its own (a lot faster than tsc). However the transpilation process does not typecheck (citation needed), so we'll need a separate type-checking workflow.
• Is cool. We want Amibot to be cool and cutting-edge so it's always fun and appealing for new contributors.

[AnshGupta01]

Hey there, as porting to bun is kinda drag and drop for the first stage, shall I start with this issue?
Also just to clarify, you want to move away from fastify in lue of fully using bun right?

[ditsuke]

Hey there, as porting to bun is kinda drag and drop for the first stage, shall I start with this issue?

Hi Ansh, sure go on.

Also just to clarify, you want to move away from fastify in lue of fully using bun right?

That's right. You can do this in stages though.

[AnshGupta01]

Alrighty, created a PR!