chore: remove long-unused codeSignResourceRules option

[dpogue]

Platforms affected

iOS

Motivation and Context

Xcode hasn't supported specifying codesigning resource rules since pre-Mavericks, so this serves no purpose anymore. Closes #563.

Description

Remove support for the --codeSignResourceRules option.

Testing

All unit tests pass.

Checklist

• [x] I've run the tests to see all new and existing tests pass
• [x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [ ] I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

Merging #1308 (6f41fbb) into master (3d6c71a) will increase coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1308      +/-   ##
==========================================
+ Coverage   78.48%   78.51%   +0.03%     
==========================================
  Files          15       15              
  Lines        1780     1778       -2     
==========================================
- Hits         1397     1396       -1     
+ Misses        383      382       -1     

Impacted Files	Coverage Δ
lib/build.js	67.21% <ø> (+0.18%)	:arrow_up:

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