Enable --inspect-functions across multiple codebases

[inlined]

Addresses feature request in #6817.

When testing I was able to get this to work, but unfortunately Chrome doesn't scan all ports, so you need to manually add the address in Chrome:

Snippet from the console output in testing:

...
✔  functions: Using debug port 9229 for functions codebase default
...
✔  functions: Using debug port 9230 for functions codebase functions2

We start with port 9229 as it's default configured in Chrome. Additional ports will need to be added manually.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 5.26316% with 18 lines in your changes missing coverage. Please review.

Project coverage is 54.24%. Comparing base (6c88d82) to head (37f7889).
Report is 565 commits behind head on master.

Files with missing lines	Patch %	Lines
src/emulator/functionsEmulator.ts	0.00%	11 Missing ⚠️
src/emulator/commandUtils.ts	16.66%	5 Missing ⚠️
src/emulator/controller.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6854      +/-   ##
==========================================
- Coverage   54.26%   54.24%   -0.02%     
==========================================
  Files         352      352              
  Lines       24519    24531      +12     
  Branches     5075     5079       +4     
==========================================
+ Hits        13305    13307       +2     
- Misses       9998    10009      +11     
+ Partials     1216     1215       -1     

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[joehan]

LGTM with one suggestion to head off issues/

[joehan]

For ports other than 9299, maybe remind users that they will have to add the port to inspector manually in this message - ie:

Using debug port 9300 for functions codebase ${backend.codebase}. You may need to add manually add this port to your inspector.