Update: Simplify core abilities registration.

[jorgefilipecosta]

This PR applies feedback provided in #108, by @aaronjorbin as a preparation for the core patch.

Testing

Verify automated testing pass.
Oppenened the editor, and the browser console, made some test requests:

wp.apiFetch({ path: wp.url.addQueryArgs('/wp/v2/abilities/core/get-site-info/run', { fields:[ 'name' ] } ) } ).then(console.log);
wp.apiFetch({ path: wp.url.addQueryArgs('/wp/v2/abilities/core/get-site-info/run', {input: { fields:[ 'name' ] } } ) } ).then(console.log);

Verified things return as expected.

[github-actions]

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>
Co-authored-by: mukeshpanchal27 <mukesh27@git.wordpress.org>

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[codecov]

Codecov Report

❌ Patch coverage is 98.23009% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.69%. Comparing base (9da857e) to head (e1179cb).

Files with missing lines	Patch %	Lines
includes/bootstrap.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #127      +/-   ##
============================================
+ Coverage     90.59%   90.69%   +0.09%     
+ Complexity      177      166      -11     
============================================
  Files            20       20              
  Lines          1489     1408      -81     
  Branches        117      116       -1     
============================================
- Hits           1349     1277      -72     
+ Misses          140      131       -9     

Flag	Coverage Δ
javascript	94.20% <ø> (ø)
unit	89.62% <98.23%> (+0.05%)	⬆️

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[mukeshpanchal27]

Some PHPCS issues