feat: refactors extra subpackage in casl/ability and adds AccessibleFields helper class

[stalniy]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.90476% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 94.09%. Comparing base (e076b31) to head (5806cd3).
Report is 68 commits behind head on master.

Files	Patch %	Lines
...ckages/casl-ability/src/extra/permittedFieldsOf.ts	70.00%	6 Missing ⚠️
packages/casl-ability/src/extra/packRules.ts	86.36%	0 Missing and 3 partials ⚠️
packages/casl-ability/src/extra/rulesToQuery.ts	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #883      +/-   ##
==========================================
- Coverage   94.93%   94.09%   -0.85%     
==========================================
  Files          34       38       +4     
  Lines         731      762      +31     
  Branches      175      181       +6     
==========================================
+ Hits          694      717      +23     
- Misses         20       27       +7     
- Partials       17       18       +1     

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[stalniy]

🚀 Released in @casl/ability@6.7.0