feat: helper to mock @aws-sdk/lib-storage Upload

[m-radzikowski]

Resolves #45

[codecov-commenter]

Codecov Report

Merging #47 (0d47995) into main (537380d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #47   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines           77        86    +9     
  Branches         9        12    +3     
=========================================
+ Hits            77        86    +9     

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/libStorage.ts	100.00% <100.00%> (ø)

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