Add support of time pointer fields in form binding

[lokhman]

This will cover the following scenarios:

type input struct {
	Field *time.Time `form:"field" time_format:"2006-01-02" time_utc:"1"`
}

[codecov[bot]]

Codecov Report

Merging #1486 into master will decrease coverage by 0.04%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #1486      +/-   ##
==========================================
- Coverage   98.49%   98.44%   -0.05%     
==========================================
  Files          41       41              
  Lines        2062     2062              
==========================================
- Hits         2031     2030       -1     
- Misses         19       20       +1     
  Partials       12       12

Impacted Files	Coverage Δ
binding/form_mapping.go	99.3% <88.88%> (-0.7%)	:arrow_down:

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[appleboy]

@lokhman conflicts. Please help to fix.

[lokhman]

@appleboy resolved for now. Please check.