feat: implement toBeSelected matcher

[AntoineThibi]

Summary

Implement toBeSelected : check that the accessibilityState props is "selected".

Test plan

• toBeSelected works, .not.toBeSelected works
• Display the propers error message if the test fail

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (8373d6a) 97.89% compared to head (324fb1e) 97.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1488      +/-   ##
==========================================
+ Coverage   97.89%   97.91%   +0.01%     
==========================================
  Files          84       85       +1     
  Lines        5087     5120      +33     
  Branches      786      792       +6     
==========================================
+ Hits         4980     5013      +33     
  Misses        107      107              

Files Changed	Coverage Δ
src/helpers/accessiblity.ts	100.00% <100.00%> (ø)
src/matchers/extend-expect.ts	100.00% <100.00%> (ø)
src/matchers/to-be-selected.ts	100.00% <100.00%> (ø)

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[MattAgn]

Sounds great to me! 🚀 Thanks for the contribution 🙏🤩
Small tip for your PR description:

• in the summary, you could say what toBeSelected checks
• in the tests, you can say globally what main test cases you cover in your unit tests

[mdjastrzebski]

Looks good! Let's merge it 🛳️

[mdjastrzebski]

🎉 Release in version: v12.4.0