Add missing test coverage for Peek methods

[bvkatwijk]

• Add test coverage for Option#peek(Runnable, Consumer)
• Add test coverage for Either#peek(Consumer, Consumer)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.82%. Comparing base (e43e44b) to head (79fd12e).
Report is 86 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2961      +/-   ##
============================================
+ Coverage     92.74%   92.82%   +0.07%     
- Complexity     5247     5265      +18     
============================================
  Files            89       89              
  Lines         12538    12552      +14     
  Branches       1604     1598       -6     
============================================
+ Hits          11628    11651      +23     
+ Misses          721      712       -9     
  Partials        189      189              

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[pivovarit]

Looking good, thanks!