feat: prints functions proxy output

[eduardoboucas]

- Summary

Takes the stderr output from the local functions proxy and pipes it to CLI's stdout. This allows functions to print data to the CLI console.

[github-actions]

📊 Benchmark results

Comparing with 3c06037

Package size: 331 MB

⬇️ 0.00% decrease vs. 3c06037

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Legend

• T-30 (3c06037): 331 MB
• T-29 (4b5a5e7): 330 MB
• T-28 (8afb502): 330 MB
• T-27 (c3d9176): 331 MB
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• T-20 (4117e1b): 331 MB
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• T-17 (526ac01): 331 MB
• T-16 (7195ad9): 331 MB
• T-15 (0d491b6): 331 MB
• T-14 (81009bc): 331 MB
• T-13 (8ef7a33): 331 MB
• T-12 (5adf7cc): 331 MB
• T-11 (d5b0175): 331 MB
• T-10 (e8e7c55): 331 MB
• T-9 (98168d1): 331 MB
• T-8 (0dfcd51): 331 MB
• T-7 (86bcad1): 331 MB
• T-6 (b6aa9c7): 331 MB
• T-5 (e36d2cb): 331 MB
• T-4 (9f7a5aa): 331 MB
• T-3 (b2839a1): 331 MB
• T-2 (373f6c5): 331 MB
• T-1 (af0e1bc): 331 MB
• T (current commit): 331 MB

[ehmicky]

Note: CI tests are failing

[eduardoboucas]

Note: CI tests are failing

The execa mock needed to be updated, otherwise the .pipe() call will fail.

Done in c9c030a.