MVP Bun runtime

[markbeep]

The absolute minimum required to add bun as a runtime to AWS compatible with both zip-based and container-based deployment. This means only the test 110 was copied over to bun and only the very necessary changes in every file were made to enable bun.

One key difference for the Dockerfile.build is that the gosu binary is copied from another Docker image (it's a completely static binary without any need for dynamically linked libs). This one one hand opens up the possibility to use more bare-bones/lightweight docker images without package managers as well as fixates the gosu version instead of relying on the apt update && apt install combination. That is potentially something that can be done for the other Dockerfile.build files as well.

To keep this PR lightweight and easy to review, all other benchmarks have been left out.

Further PRs for Bun (GCP/Azure) are based on this one.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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