* update directory structure to support the icode platform

* remove source code generated by protobuf

* move code into the core directory

* add gaussian sampling method with noise table

* add table sampling test and agent param_size test

* add model param_size test

* get param size of paddle demo

* rename gaussian_table_sampling to cached_gaussian_sampling

* add unittest to sampling method and uniform indentation to 2 spaces
Co-authored-by: NTomorrowIsAnOtherDay <2466956298@qq.com>

* remove depedence on predictor.clone()

* remove commented lines

* remove FATAL logging

* remove ESAgent's construnction function based on cxx_config

* mv prototxt

* rename SamplingKey to SamplingInfo

* add asynchronous lsagent

* rename AsyncAgent to AsyncESAgent

* fix comments

* Update async_es_agent.cc

* Sampling Info

* commemt

* commemt

* add optimizer factory

* add file:optimizer_factory

* copyright

* remove dependence on algorithm.h