Support non-zero hidden state for LSTM

* fully support non-zero hidden state for LSTM

* check dims of hidden state for LSTM

* fix failed test Test_Model.TextRecognition

* add new tests for LSTM w/ non-zero hidden params
Co-authored-by: NJulie Bareeva <julia.bareeva@xperience.ai>

Improves support for Unix non-Linux systems, including QNX

* Fixes #20395. Improves support for Unix non-Linux systems. Focus on QNX Neutrino.
Signed-off-by: Npromero <promero@mathworks.com>

* Update system.cpp

* Fix bug while loading onnx model in debug

* dnn: fix other .at using
Co-authored-by: NAlexander Alekhin <alexander.a.alekhin@gmail.com>

backport of commit: e5841d31