actions: add HeadObject action

[paolobarbolini]

No description provided.

[codecov]

Codecov Report

Merging #18 (7031de0) into main (8e412df) will increase coverage by 0.29%.
The diff coverage is 94.54%.

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   92.16%   92.45%   +0.29%     
==========================================
  Files          22       23       +1     
  Lines        1046     1100      +54     
==========================================
+ Hits          964     1017      +53     
- Misses         82       83       +1     

Impacted Files	Coverage Δ
src/actions/head_object.rs	94.00% <94.00%> (ø)
src/bucket.rs	98.11% <100.00%> (+2.03%)	⬆️
src/method.rs	100.00% <100.00%> (ø)

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[guerinoni]

Very good!