提供自定义 directive bean 的方式

[wangyuheng]

1. graphqlContext 增加 http headers 参数传递
2. 增加 自定义 directive component 注册的方式
3. 提供 自定义 directive component 的示例

close #68

[codecov[bot]]

Codecov Report

Merging #71 (c4a812f) into release/1.5.0 (a51f6cf) will increase coverage by 0.26%. The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##             release/1.5.0      #71      +/-   ##
===================================================
+ Coverage            65.60%   65.87%   +0.26%     
  Complexity              55       55              
===================================================
  Files                  113      114       +1     
  Lines                 2326     2344      +18     
  Branches               160      162       +2     
===================================================
+ Hits                  1526     1544      +18     
  Misses                 722      722              
  Partials                78       78              

Impacted Files	Coverage Δ	Complexity Δ
...althcare/arc/graphql/GraphqlAutoConfiguration.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...healthcare/arc/graphql/rest/GraphQLController.java	91.66% <100.00%> (+1.34%)	0.00 <0.00> (ø)
...re/arc/graphql/support/DirectivePostProcessor.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...are/arc/graphql/support/RuntimeWiringRegistry.java	90.24% <100.00%> (+1.05%)	0.00 <0.00> (ø)

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