IDEA: implement `bun` to consolidate tooling

[brandonjpierce]

Kudos to Charlie for planting the seed

• Can replace tsup: https://bun.sh/docs/bundler
• Can replace vitest: https://bun.sh/docs/cli/test
• Can replace pnpm: https://bun.sh/docs/cli/install
• Can replace zx: https://bun.sh/docs/cli/run or https://bun.sh/docs/cli/bunx

[brandonjpierce]

Will spend some time documenting pros, cons, differences, etc.

[charliewilco]

here's a good thread on replacing tsup completely.

https://github.com/oven-sh/bun/issues/5141 https://github.com/ryoppippi/bun-plugin-isolated-decl

[charliewilco]

the only real thing the bun test runner is missing is timers

https://github.com/oven-sh/bun/issues/5480