Pass `NODE_OPTIONS` when spawning `firebase-functions`

[gustavopch]

With this change, it's possible to pass a loader to Node.js via the NODE_OPTIONS environment variable to enable support for TypeScript in the Cloud Functions emulator during development. For example:

NODE_OPTIONS='--loader=@esbuild-kit/esm-loader' firebase emulators:start

It doesn't affect the deployed Cloud Functions which still need to be transpiled.

Closes https://github.com/firebase/firebase-tools/issues/6112.

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[gustavopch]

Signed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e17a4b3) 54.59% compared to head (4a9f2ee) 54.59%. Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6191   +/-   ##
=======================================
  Coverage   54.59%   54.59%           
=======================================
  Files         346      346           
  Lines       23663    23663           
  Branches     4870     4870           
=======================================
  Hits        12919    12919           
  Misses       9561     9561           
  Partials     1183     1183           

Files Changed	Coverage Δ
src/deploy/functions/runtimes/node/index.ts	36.69% <ø> (ø)

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[gustavopch]

@taeold @blidd-google Anything preventing the merge? It's just 1 line added.

[Aetherall]

Is this PR stuck ? I can help if needed we are waiting for this for months