Add source analyze doc(#954)

[it-linnan]

[codecov[bot]]

Codecov Report

Merging #984 (6f1197f) into master (2dbf604) will increase coverage by 0.02%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #984      +/-   ##
============================================
+ Coverage     11.38%   11.41%   +0.02%     
  Complexity       39       39              
============================================
  Files           311      312       +1     
  Lines          9088     9108      +20     
  Branches       1252     1253       +1     
============================================
+ Hits           1035     1040       +5     
- Misses         7899     7918      +19     
+ Partials        154      150       -4     

Impacted Files	Coverage Δ
...pring/parser/AsyncInitBeanDefinitionDecorator.java	10.00% <0.00%> (-8.52%)	:arrow_down:
...onfigure/runtime/SofaRuntimeAutoConfiguration.java	91.17% <0.00%> (-5.70%)	:arrow_down:
...om/alipay/sofa/isle/deployment/DependencyTree.java	2.89% <0.00%> (-0.09%)	:arrow_down:
...om/alipay/sofa/boot/env/EnvironmentCustomizer.java	0.00% <0.00%> (ø)
...m/alipay/sofa/boot/startup/BootStageConstants.java	0.00% <0.00%> (ø)
...y/sofa/isle/loader/DynamicSpringContextLoader.java	0.00% <0.00%> (ø)
...alipay/sofa/healthcheck/util/HealthCheckUtils.java	0.00% <0.00%> (ø)
...utoconfigure/isle/SofaModuleAutoConfiguration.java	0.00% <0.00%> (ø)
...tup/stage/StartupSpringApplicationRunListener.java	0.00% <0.00%> (ø)
...a/isle/spring/factory/BeanLoadCostBeanFactory.java
... and 13 more

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