LowLatency v2 ngraph transformation (#5160)
* LowLatency 2.0: transformation and unit tests
* low latency 2.0: unit tests
* documentation and ngraph codestyle
* update CNN Interface of LowLatency transformation
* fix build on Windows
* fix build on Windows
* investigation of a failed build on Win OS
* ngraph codestyle
* fix build (werrors)
* New unit tests, refactoring
* update functional tests for Memory
* update LowLatency functional tests
* extend Memory tests to cover LowLatency v2 transformation
* clean up, code style
* fix unit tests
* update and fix unit tests, add feature to apply LLTv2 after LLTv1
* update docs, refactoring
* add several gna tests to skip config
* fix python api tests
* update python api, rename LowLatency_v2 to LowLatency2
* deprecate LowLatency v1
* Deprecate LowLatency v1 in IE
* fix wrong merge, codestyle
* resolve review comments
* fix python test
* update skip config
* apply online review notes, fix unit tests
* clean up, code style
* fix docs
* Use debug_messages instead of exceptions in llt v2
* fix unit tests
* Resolve review remarks