增加了ApolloJsonValue来支持Json格式的配置项

[weiguang-zz]

Features

1. Support injecting Json values with @ApolloJsonValue, the supported format is the same as Spring @Value, such as @ApolloJsonValue("${someJsonPropertyKey}")
2. Support auto updating injected values for @ApolloJsonValue

Usages

Suppose we have a type SomeObject, which has 2 properties: someString and someInt.

And we have a config as:

someJsonPropertyKey={"someString":"someValue", "someInt":10}

Then we can inject it on fields:

@ApolloJsonValue("${someJsonPropertyKey}")
private SomeObject someObject;

Or on methods:

@ApolloJsonValue("${someJsonPropertyKey}")
public void setJsonBeans(SomeObject someObject) {
  this.someObject = someObject;
}

Providing default value is suggested, such as:

@ApolloJsonValue("${someJsonPropertyKey:{\"someString\":\"someDefaultValue\", \"someInt\":10}}")
private SomeObject someObject;

[codecov-io]

Codecov Report

Merging #989 into master will increase coverage by 0.37%.
The diff coverage is 91.37%.

@@             Coverage Diff              @@
##             master     #989      +/-   ##
============================================
+ Coverage     48.27%   48.64%   +0.37%     
- Complexity     1647     1671      +24     
============================================
  Files           360      364       +4     
  Lines         10054    10144      +90     
  Branches       1012     1026      +14     
============================================
+ Hits           4854     4935      +81     
- Misses         4844     4847       +3     
- Partials        356      362       +6

Impacted Files	Coverage Δ	Complexity Δ
...pollo/spring/annotation/ApolloConfigRegistrar.java	100% <100%> (ø)	2 <0> (ø)	⬇️
.../spring/config/ConfigPropertySourcesProcessor.java	100% <100%> (ø)	3 <0> (ø)	⬇️
...apollo/spring/config/PropertySourcesProcessor.java	95.34% <100%> (-4.66%)	15 <5> (+3)
.../framework/apollo/spring/property/SpringValue.java	100% <100%> (ø)	19 <6> (+4)	⬆️
...rk/apollo/spring/property/SpringValueRegistry.java	100% <100%> (ø)	3 <3> (?)
...work/apollo/spring/annotation/ApolloProcessor.java	100% <100%> (ø)	8 <8> (?)
...o/spring/annotation/ApolloAnnotationProcessor.java	100% <100%> (ø)	7 <7> (-5)	⬇️
...ip/framework/apollo/internals/DefaultInjector.java	70.37% <100%> (+1.13%)	3 <0> (ø)	⬇️
...work/apollo/spring/property/PlaceholderHelper.java	81.53% <60%> (-3.92%)	24 <2> (+2)
...apollo/spring/annotation/SpringValueProcessor.java	84.61% <87.5%> (-1.82%)	17 <8> (-15)
... and 7 more

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[nobodyiam]

looks good