Support placeholder in SofaService and SofaReference annotation. (#264)

[QilongZhang]

• support placeholder in SofaService and SofaReference annotation

[codecov]

Codecov Report

Merging #282 into master will increase coverage by 0.65%.
The diff coverage is 85.1%.

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
+ Coverage   59.53%   60.19%   +0.65%     
==========================================
  Files          72       73       +1     
  Lines        1735     1781      +46     
  Branches      197      203       +6     
==========================================
+ Hits         1033     1072      +39     
- Misses        556      557       +1     
- Partials      146      152       +6

Impacted Files	Coverage Δ
...ime/spring/ServiceAnnotationBeanPostProcessor.java	64.86% <100%> (+3.86%)	⬆️
...tation/PlaceHolderAnnotationInvocationHandler.java	80% <80%> (ø)

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