mutationWithClientMutationId: pass through extensions

[IvanGoncharov]

Fixes #244

[codecov]

Codecov Report

Merging #333 (9c7a067) into main (54c22ae) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #333   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines          629       635    +6     
  Branches        37        37           
=========================================
+ Hits           629       635    +6     

Impacted Files	Coverage Δ
src/mutation/__tests__/mutation-test.js	100.00% <100.00%> (ø)
src/mutation/mutation.js	100.00% <100.00%> (ø)

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[JCMais]

Thank you @IvanGoncharov