* Extend envoy metric service, scope and OAL lexer/parser.

* Finish metric extension and oal.

* Make test env works.

* Finish test of envoy connection and memory metric.

* Change document.

* Finish docker compose test.

* Merge module and provider of mesh

* Finish the skeleton of mesh receiver.

* Finish mesh dispatcher.

* Fix missing timebucket

* Buffer stream.

* Buffer file reader.

* Buffer library performance test and functional test successfully.

* Fixed the code merge mistake.

* SkyWalking's trace receiver implementation.

* SkyWalking's trace receiver implementation.

* Delete collector module.

Module class rename to ModuleDefine, Module is the JDK9 class. It is conflict with our Module class. (#1168)