* fit context to standard context

[unlikezy]

#1123 (comment)
This PR try to provide a type of solution.
I look forward to more suggestion and feedback.

[codecov]

Codecov Report

Merging #1876 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1876      +/-   ##
==========================================
+ Coverage   98.69%   98.74%   +0.04%     
==========================================
  Files          40       38       -2     
  Lines        2229     2157      -72     
==========================================
- Hits         2200     2130      -70     
+ Misses         16       15       -1     
+ Partials       13       12       -1     

Impacted Files	Coverage Δ
context.go	98.39% <100.00%> (-0.05%)	⬇️
gin.go	99.11% <100.00%> (-0.01%)	⬇️
tree.go	100.00% <0.00%> (ø)
debug.go	96.00% <0.00%> (ø)
binding/form.go	100.00% <0.00%> (ø)
binding/binding.go	100.00% <0.00%> (ø)
binding/form_mapping.go	100.00% <0.00%> (ø)
binding/multipart_form_mapping.go
... and 3 more

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[ekle]

#2029 does use the http request context instead of creating a new one