* Provide profile task downstream to sniffer
* fix agent unit testcase issue
* add profile switch config on sniffer
* fix es error
* 1. add @DefaultImplementor on the sniffer profile task service
2. change ProfileTaskExecutionService#PROFILE_TASK_READY_SCHEDULE to final and remove volatile
2. fix style error
* change timeFromStartMills use `<` to compare
* 1. add `maxSamplingCount` to profile task
2. make profile task limit to the common package
* 1. change `agent.active_profile` to `profile.active` and make true on default
2. add `maxSamplingCount` in profile task
3. use `createTime` to check has new command list
4. add task re-check before process profile task
* 1. add `profile-receiver` document
2. change `ProfileTaskExecutionService` use single schedule thread pool
3. cache dont need fetch data when no data, use auto-fresh mechanism only
* remove navigate time judge, fix comment wrong meaning
* Make Jaeger receiver works in 12450 as default.
* Finish compile and codebase.
* Make codes runnable.
* Finish Jaeger query tests.
* Add document for jaeger receiver.
* Add readme.
* Fix a break link.
* Finish doc.
* Codebase for zipkin span persistence.
* Fix missing fields in storage.
* Miss the latency field.
* Finish some tests.
* Fix wrong latency.
* Finish doc and reset application.yml
* Make the description more clear.
* Change some codes to make zipkin receiver works, not done yet.
* @adriancole Zipkin receiver is coming back again.
* Fix document and fix for Zipkin receiver.
* Fix some bugs.
* Fix register bug.
* Fix transfer bug for new backend core.
mrproliu
panjuan
吴晟 Wu Sheng
彭勇升 pengys