Add web package for web applications support

[limpo1989]

No description provided.

[codecov]

Codecov Report

Attention: 149 lines in your changes are missing coverage. Please review.

Comparison is base (e021b41) 81.81% compared to head (2012f11) 79.19%.

Files	Patch %	Lines
web/binding/form.go	26.66%	69 Missing and 8 partials ⚠️
web/binding/binding.go	38.63%	45 Missing and 9 partials ⚠️
conf/validate.go	68.57%	8 Missing and 3 partials ⚠️
web/render/json.go	66.66%	2 Missing and 1 partial ⚠️
web/render/xml.go	66.66%	2 Missing and 1 partial ⚠️
web/render/html.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   81.81%   79.19%   -2.63%     
==========================================
  Files          45       55      +10     
  Lines        3553     3830     +277     
==========================================
+ Hits         2907     3033     +126     
- Misses        508      637     +129     
- Partials      138      160      +22     

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