graph : reuse SSM graphs (#16490)
* graph : reuse hybrid graphs
* graph : reuse recurrent graphs
* graph : fix reuse check for recurrent inputs
* memory : move the recurrent state into the memory context
* Revert "memory : move the recurrent state into the memory context"
This reverts commit 00f115fe810815d4a22a6dee0acc346131e970e1.
* cont : fix build
