add relation bind

[HQ6968]

add Wrappter and Builder oprate outside for builder apis

[codecov-io]

Codecov Report

Merging #11 into master will decrease coverage by 0.42%.
The diff coverage is 58.97%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   82.57%   82.14%   -0.43%     
==========================================
  Files          11       11              
  Lines         660      689      +29     
==========================================
+ Hits          545      566      +21     
- Misses         70       77       +7     
- Partials       45       46       +1

Impacted Files	Coverage Δ
builder.go	81.94% <100%> (+2.36%)	⬆️
relation.go	76.04% <52.17%> (-2.44%)	⬇️
wrapper.go	81.56% <58.33%> (-1.87%)	⬇️

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