* rocks: fixed wrong version of luarocks.

* implement correlation

* fix luaunit and add doc and example code

* Adding document and rockspec file

* resolve document issue

* remove empty value

* fix code style
Co-authored-by: NMrproliu <mrproliu@lagou.com>

Co-authored-by: NMrproliu <mrproliu@lagou.com>

Co-authored-by: NMrproliu <mrproliu@lagou.com>

Co-authored-by: NMrproliu <mrproliu@lagou.com>

* adapt the new v3 protocol

* add e2e standone test
Co-authored-by: Nkezhenxu94 <kezhenxu94@163.com>

* Uniform the SpanLayer type name

* update the expectedData.yml

Remove a wrong statement in the release guide.

* used the nginx lua code style for tracing context.

* fixed test cases.

* fixed

* fixed test cases

* fixed

* fixed code style of register.

* code style of segment.

* add test cases for segment ref.

* fixed

* fixed bug in TracingContext:drainAfterFinished
Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>
Co-authored-by: NDaming <zteny@foxmail.com>

* Fix a wrong method name and expose the upstream address as the variable

* Fix words.

* Fix method name and upstream name.

* Try to fix e2e.

* Remove 3 `tonumber` to erase the i64 not supported in Lua issue.

* Fix span test case

* Fix segment ref test cases.

luarocks is package manager for lua
Co-authored-by: NJared Tan <jian.tan@daocloud.io>

* fix register local.

* fix e2e.

* add test cases for ngx lua.

* add more test cases.

* add ngx lua to github action.

* Compatible with lua and ngx lua

* set up e2e
Co-authored-by: Nzhang-wei <pknfe@outlook.com>

This reverts commit ac4ba62d.

* add test cases for ngx lua.

* Compatible with lua and ngx lua