Fix #1858: Add query params binding support for anonymous struct pointer field

[pwli0755]

try to fix #1858

if the anonymous struct filed is a pointer, try dig one step deeper and get the underlaying struct

[codecov]

Codecov Report

Merging #1861 (2d930a9) into master (a4ab482) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1861      +/-   ##
==========================================
+ Coverage   89.57%   89.59%   +0.02%     
==========================================
  Files          31       31              
  Lines        2686     2740      +54     
==========================================
+ Hits         2406     2455      +49     
- Misses        180      184       +4     
- Partials      100      101       +1     

Impacted Files	Coverage Δ
bind.go	89.22% <100.00%> (+0.33%)	⬆️
router.go	95.03% <0.00%> (-1.02%)	⬇️

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[aldas]

I assume you want probably want to use if here instead of for?

[aldas]

I think this case should return an error and not silently hide the error that developer has made.
Let's just enforce rule that

This is NOT valid/allowed:

result := struct {
		*Bar `query:"bar"`   // or param:"bar"
	}{&Bar{}}

This is OK:

result := struct {
		*Bar  // or json:"bar" as json has its own implementation
	}{&Bar{}}

[aldas]

LGTM