feat:support startup endpoint

[HzjNeverStop]

fix #672

[glmapper]

LGTM

[codecov-commenter]

Codecov Report

Merging #673 into master will increase coverage by 0.41%.
The diff coverage is 76.02%.

@@             Coverage Diff              @@
##             master     #673      +/-   ##
============================================
+ Coverage     51.40%   51.81%   +0.41%     
+ Complexity       87       77      -10     
============================================
  Files           276      291      +15     
  Lines          7988     8183     +195     
  Branches       1134     1139       +5     
============================================
+ Hits           4106     4240     +134     
- Misses         3434     3488      +54     
- Partials        448      455       +7     

Impacted Files	Coverage Δ	Complexity Δ
...onfigure/runtime/SofaRuntimeAutoConfiguration.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...webserver/StartupJettyServletWebServerFactory.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...server/StartupUndertowServletWebServerFactory.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...m/alipay/sofa/boot/constant/SofaBootConstants.java	90.90% <ø> (ø)	0.00 <0.00> (ø)
...utoconfigure/startup/SofaStartupConfiguration.java	46.15% <46.15%> (ø)	0.00 <0.00> (?)
...boot/actuator/startup/SofaBootStartupEndPoint.java	50.00% <50.00%> (ø)	1.00 <1.00> (?)
...lipay/sofa/startup/spring/SpringContextAwarer.java	62.50% <62.50%> (ø)	0.00 <0.00> (?)
...va/com/alipay/sofa/startup/SofaStartupContext.java	72.72% <72.72%> (ø)	0.00 <0.00> (?)
...y/sofa/startup/spring/IsleSpringContextAwarer.java	75.00% <75.00%> (ø)	0.00 <0.00> (?)
...up/spring/StartupSpringApplicationRunListener.java	93.75% <93.75%> (ø)	0.00 <0.00> (?)
... and 28 more

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[alaneuler]

LGTM