feat: allow extension of helper app plists with extendHelperInfo

[MarshallOfSound]

For apps that want to customize the Helper app plist files they currently have to do so in an afterCopy or other out-of-band step. Adding extendHelperInfo to match extendInfo makes it much easier to extend these plist files.

This PR also ensures we set CFBundleShortVersionString and CFBundleVersion on helper plists.

[codecov]

Codecov Report

Merging #1233 (a4ce519) into main (7d9b958) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1233   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          716       729   +13     
=========================================
+ Hits           716       729   +13     

Impacted Files	Coverage Δ
src/mac.js	100.00% <100.00%> (ø)

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[ckerr]

I made some readability suggestions / nits but nothing major. Overall looks reasonable.

[ckerr]

The first arg of each array in updateIfExists is used as a key. Maybe this variable should be an object instead of an array of arrays e.g.

    const updateIfExists = { 
      'helperRendererPlist': ['(Renderer)', true],
      'helperPluginPlist': ['(Plugin)', true],
      'helperGPUPlist': ['(GPU)', true],
      'helperEHPlist': ['EH'],
      'helperNPPlist': ['NP']
    }

Not a big deal but it would make the code that uses it a little easier to read

[MarshallOfSound]

It's used as a key on a different object, I think this would be harder to read because you'd have to pull the keys and values separately via entries() or with two calls two keys() and values(). Also code hasn't been introduced here, in the spirit of minimal and related changes we probably shouldn't refactor here.

[malept]

I'll take a closer look once Charles's comments are addressed.

[MarshallOfSound]

Updated as per PR comments @ckerr @malept

[malept]

This looks good conceptually. Just some cleanup needed, then we should be good to merge.

[LarryKlugerDS]

Hi @MarshallOfSound , This looks great!
Can it be used to set the info.plist for an app's private protocol? (Set via app.setAsDefaultProtocolClient)

Can you supply instructions on how to do so?
Many thanks, Larry