* unroll ti transformation, lstm sequence ie, rnn sequence ie
* Update unroll ti transformation, added GRUSequenceIE op, fixed several ti e2e tests
* apply ngraph codestyle
* fix naming after unroll transformation
* Added default constructor for RNNCellBase, fix conversions
* copy runtime info
* added UnrollTI unit tests
* clean up, move sequence ops in a separate PR
* clean up, ngraph code style
* temporary disable ngraph reader unit tests for ti
* fix unit tests on windows
* naming: use name of tensor after unroll tensor iteration transformation
* apply transformations to tensor iterator body, separate pass for ti transformations, fix naming issue
* fix build
* remove TensorIterationTransformations pass
* fix includes
* resolve conflicts
* fix build: incorrect includes
* remove split/concat for single iteration of TI, update to opset4, unit tests
* use matcher pass instead of graph rewrite
* try to enable UnrollTI transformation for all plugins
* disable unrollTI transformation for cpu plugin
* resolve review comments, enable unit tests
* update transformation description
* fix unit tests
* update transformation pipeline
* clean up
* clean up
* resolve review comments
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