[WIP] Add axum implementation

[AndreyErmilov]

[codecov-commenter]

Codecov Report

Merging #27 (e2f63c6) into master (af352d3) will decrease coverage by 5.09%. The diff coverage is 22.61%.

:exclamation: Current head e2f63c6 differs from pull request most recent head d353d78. Consider uploading reports for the commit d353d78 to get more accurate results

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   71.00%   65.91%   -5.10%     
==========================================
  Files          41       44       +3     
  Lines         714      798      +84     
==========================================
+ Hits          507      526      +19     
- Misses        207      272      +65     

Impacted Files	Coverage Δ
hitbox-axum/src/layer.rs	0.00% <0.00%> (ø)
hitbox-axum/src/service.rs	0.00% <0.00%> (ø)
hitbox-axum/src/cacheable.rs	52.77% <52.77%> (ø)

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[singulared]

Closed in favour #25