Allow chaining mockClear and mockReset

[iofjuupasli]

Summary

Return mock in mockClear and mockReset to allow chain, e.g. setup right after reset

Test plan

const mock = jest.fn();
mock.mockReset().mockImplementation(() => 1);

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[codecov-io]

Codecov Report

Merging #4475 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4475      +/-   ##
==========================================
+ Coverage   56.84%   56.85%   +0.01%     
==========================================
  Files         186      186              
  Lines        6298     6300       +2     
  Branches        3        3              
==========================================
+ Hits         3580     3582       +2     
  Misses       2717     2717              
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-mock/src/index.js	84.9% <100%> (+0.11%)	⬆️

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[cpojer]

Works for me. Thanks for the PR!

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