Adding the ability to set exit codes from command rejections

[rorticus]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Commands can now reject with CommandErrors now instead of regular errors. These are backwards compatible with the current Error objects.

return Promise.reject({
    message: 'Some error message',
    exitCode: 1
});

If exitCode is returned, and not undefined, the process will be exited with that exit code.

Part of dojo/cli-test-intern#7

[codecov-io]

Codecov Report

Merging #114 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   99.45%   99.45%   +<.01%     
==========================================
  Files          15       15              
  Lines         364      368       +4     
  Branches       40       42       +2     
==========================================
+ Hits          362      366       +4     
  Partials        2        2

Impacted Files	Coverage Δ
src/registerCommands.ts	100% <100%> (ø)	✅

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