isolate sadl code in unit and make units using sadl uniform build flags

source/Lib/CommonLib/CMakeLists.txt

source/Lib/CommonLib/IntraPrediction.cpp

source/Lib/CommonLib/NNPostFilter.cpp

source/Lib/CommonLib/NNPostFilter.h

source/Lib/CommonLib/NNSuperResolution.cpp

source/Lib/CommonLib/NNSuperResolution.h

source/Lib/CommonLib/intra_pred_sadl.cpp

source/Lib/CommonLib/intra_pred_sadl.h

source/Lib/EncoderLib/CMakeLists.txt

source/Lib/EncoderLib/EncNNFilter.cpp

source/Lib/EncoderLib/EncNNFilter.h