fix: clientConfig can be omitted

[alexander-fenster]

We don't really need to force users to pass clientConfig in the options, undefined works just fine.

[codecov]

Codecov Report

Merging #617 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #617      +/-   ##
=========================================
- Coverage   88.42%   88.4%   -0.03%     
=========================================
  Files          65      65              
  Lines        4129    4130       +1     
  Branches      319     320       +1     
=========================================
  Hits         3651    3651              
- Misses        386     387       +1     
  Partials       92      92

Impacted Files	Coverage Δ
src/operationsClient.ts	17.14% <0%> (-0.25%)	⬇️

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