feat(binding): support custom struct tag

[mtt0]

#2719

[codecov]

Codecov Report

Merging #2720 (6e61cf8) into master (4fe5f3e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2720      +/-   ##
==========================================
+ Coverage   98.67%   98.70%   +0.02%     
==========================================
  Files          41       41              
  Lines        2036     2078      +42     
==========================================
+ Hits         2009     2051      +42     
  Misses         15       15              
  Partials       12       12              

Impacted Files	Coverage Δ
binding/form_mapping.go	100.00% <100.00%> (ø)
recovery.go	97.14% <0.00%> (-0.05%)	⬇️
tree.go	100.00% <0.00%> (ø)
debug.go	100.00% <0.00%> (ø)
render/json.go	85.29% <0.00%> (ø)
binding/form.go	100.00% <0.00%> (ø)
render/msgpack.go	100.00% <0.00%> (ø)
binding/multipart_form_mapping.go	100.00% <0.00%> (ø)
gin.go	99.18% <0.00%> (+0.05%)	⬆️
... and 1 more

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[thinkerou]

lgtm