* unfold attributes

* Remove unnecesary if

* Rename run() -> lstm_pass()

* Unify usage of LSTMForward for one and bi directional LSTM

* Unify LSTMForward return values for one and bi directional LSTM

* Dirty moving LSTMForward into fused directory

* Accept lstm direction as string instead of enum

* Fused op which uses decompose_op in onnx_importer

* Rename LSTMForward -> LSTMSequence

* Split LSTMSequence to cpp and hpp

* Remove LSTMDirection enum

* Add getters for class fields

* Adjust constructors

* Add direction validation.

* Add support of LSTMSequence op in serializer

* Reorder fused op input order

* Style fix

* Fix for reorder of inputs

* Use NodeTypeInfo instead of static string

* Node -> value in doc

* Add doc for prepare_input method

* Fix shape inference

* Use enum instead of string for direction

* Add Type prop unit test

* Fix style