feat: add bun and deno support

[Uzlopak]

Checklist

• run npm run test && npm run benchmark --if-present
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[jean-michelet]

Not against it, but I think we don't official support these runtime through the organization right?

[gurgunday]

Not officially, yes, we're Node first

But I think we have an unofficial policy to support other runtimes in a best-effort manner, meaning as long as they don't disrupt anything related to Node (see alternative runtimes job in Fastify, there was some discussion around it with similar conclusions)

[Uzlopak]

@jean-michelet
@gurgunday

Would be cool if there is a review. :)

Pinned swc to 1.20 because of

swc-project/swc#11129

[gurgunday]

Pinned swc to 1.20 because of

swc-project/swc#11129

That was my only question actually

lgtm

[jean-michelet]

Recommend to wait for @fastify/leads feedback.

[Uzlopak]

In #408 @mcollina approved the corresponding changes.