* [MO, TF] Support Custom Wide and Deep CTR model by MO It implements implicit support of EmbeddingSegmentsMean operation through decomposition. Also, this extends the current transformation to fuse TensorFlow sub-graph (for Wide and Deep model family) containing SparseSegmentSum and SparseSegmentMean operations into EmbeddingSegmentsSum or EmbeddingSegmentsMean. Signed-off-by: Roman Kazantsev <roman.kazantsev@intel.com> * Fix unit-tests after modifications of SparseToDense and EmbeddingSegmentsOperationFusing Signed-off-by: Roman Kazantsev <roman.kazantsev@intel.com> * Document SparseSegmentMean support Signed-off-by: Roman Kazantsev <roman.kazantsev@intel.com> * Add computation scheme for normalization coeffs and correct documentation Signed-off-by: Roman Kazantsev <roman.kazantsev@intel.com>