* [PT FE] Initial LSTM impl
* Support aten::lstm operation
* Support aten::gru and aten::rnn_{relu,tanh}
* Apply suggestions from code review
* Fix build
* Simplify implementation
* More simplification
* Update src/frontends/pytorch/src/op/lstm.cpp
* Simplification
* Use default LSTM helpers
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Co-authored-by: Roboreptile <piotr.krzeminski@intel.com>