The current version generates codes from proto files into a global namespace, which causes failure when there is a package in the users' application whose name is the same as the generated one, this patch moves the generated codes into the `skywalking` module and thus avoid conflicts.

Resolves https://github.com/apache/skywalking/issues/5406

* update CHANGELOG

* update version
Co-authored-by: Nhuawei <huawei@bit-s.cn>
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

Co-authored-by: Nhuawei <huawei@bit-s.cn>

Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

* Add elasticsearch plugin

* fix style

* fix style
Co-authored-by: Nhuawei <huawei@bit-s.cn>

closes https://github.com/apache/skywalking/issues/4993

* Add Flask Http Params

* Add Flask Http Params
Co-authored-by: Nhuawei <huawei@bit-s.cn>

* Created venv builders for linux/windows and req flashers + use documentation

* aadd license headers to scripts

* moved scripts, updated paths, changed how reqs are installed, updated linux venv bin path

* update license checker to accomodate for shebangs and batchfile comments

Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>