definitions: Implement GSP-729 Redesign HTTP Signer

[JinnyYi]

ref: #731

[codecov]

Codecov Report

Merging #732 (4fe58fb) into master (2f3b874) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #732      +/-   ##
==========================================
- Coverage   12.50%   12.47%   -0.04%     
==========================================
  Files          22       22              
  Lines        1479     1483       +4     
==========================================
  Hits          185      185              
- Misses       1287     1291       +4     
  Partials        7        7              

Flag	Coverage Δ
unittests	12.47% <0.00%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
types/operation.generated.go	0.00% <0.00%> (ø)

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