Expose this.equals to custom matchers.

[cpojer]

Summary

This was previously exposed through jasmine.matcherUtils.equals. It's now part of the custom matcher API so that it can be used in libraries like Relay.

Test plan

See added test.

[codecov-io]

Codecov Report

Merging #3469 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #3469      +/-   ##
=========================================
+ Coverage    64.1%   64.1%   +<.01%     
=========================================
  Files         179     179              
  Lines        6647    6648       +1     
  Branches        5       5              
=========================================
+ Hits         4261    4262       +1     
  Misses       2384    2384              
  Partials        2       2

Impacted Files	Coverage Δ
packages/jest-matchers/src/index.js	95.45% <100%> (+0.05%)	⬆️

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[github-actions]

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