* Change OAL generator tool to runtime.
Step 1. change project structure. API links and maven pom.
* Part of metrics class generation
* Metrcis class generated.
* Set up the basic structure of new OAL engine.
* Finish metrics generation.
* Support dispatcher generation.
* Format codes.
* Generate dispatcher all methods.
* Implement disable in hardcode.
* Clear up
* Fix compile startup.
* Update license and document of new OAL engine.
* Fix rat.
* Disable class output in default
* Copy from @kezhenxu94 's test PR, https://github.com/apache/skywalking/pull/3110
* Wait for the mount command to finish
* Make scope meta configurable.
* Fix test cases in ci.
* Change step 1
* Refactor step 2
* Other compile issue done. Prepare the generator changes.
* Revert some wrong changes to Istio receiver.
* Step 3, make compile pass.
* Try to make CI passed.
* Add a check.
* Fix generated code style
* Provide new and extendable dispatcher generator tool
* Fix startup.
* Can't guarantee the dispatchers are always existing. Put explicit comments at there to avoid confusion, since this is different with old version.
* Fix a H2 query for endpoint search.
* Fix a wrong mysql alarm query.
* Provide new document and `generate-tool-grammer` module.
* Add missing last section of document.
* Fix typo
* Relocate the @ScopeDeclaration annotation, make it more sense. Also remove the useless @SourceType annotation. And adjust document for these changes
* ScopeDeclaration can be used once for each class only, now.
* Move oal tool back into main repo, and fix compile issue.
* Fix two bugs.
* Remove all generated codes.
* Make all oal generated codes out of source control.
* Make mvn compile and package work.
* Fix test cases.
* Make compile right and provide new documents.
* Remove an unnecessary tokens file.
吴晟 Wu Sheng
kezhenxu94
Alan Lau
kezhenxu94
彭勇升 pengys
康智冬