refactor: move function builders to functions lib

[eduardoboucas]

- Summary

Moves the function builders (netlify-lambda and zip-it-and-ship-it) to a new location, where all the JS runtime files will live.

Part of #2806.

- Test plan

N/A

[github-actions]

📊 Benchmark results

Comparing with 25a0b59

Package size: 331 MB

(no change)

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Legend

• T-15 (25a0b59): 331 MB
• T-14 (c3de183): 331 MB
• T-13 (c8ae08b): 331 MB
• T-12 (dd9bbf2): 331 MB
• T-11 (16ee6ec): 331 MB
• T-10 (4682123): 331 MB
• T-9 (5396527): 331 MB
• T-8 (768013b): 331 MB
• T-7 (8adc5f6): 331 MB
• T-6 (d627883): 331 MB
• T-5 (7d50260): 398 MB
• T-4 (24a5b5e): 398 MB
• T-3 (92a198f): 398 MB
• T-2 (388c551): 398 MB
• T-1 (ccff8c5): 398 MB
• T (current commit): 331 MB

[erezrokah]

I don't think we need to update this section https://cli.netlify.com/netlify-dev/#function-builders-function-builder-detection-and-relationship-with-netlify-lambda with the removal of the README.

Just sharing for context

[erezrokah]

@eduardoboucas, that failing test is flaky. I'll look into it - if the PR passes on other OS I think it's ok

[eduardoboucas]

@eduardoboucas, that failing test is flaky. I'll look into it - if the PR passes on other OS I think it's ok

I'm not in a rush to merge this, so I don't mind waiting a bit more and restarting the CI if we want to be cautious. I'll leave it up to you. Thanks for looking into it!