Compile with capture (#629)

* Simple kernel generation

* Remove the generate kernel from graph_utils

* fix multi-output with compile

* fuse with stopgrad

* v1 input, output capture in compile

* cleanup tree update with visitor update

* nit

* remove todo

* state for model, optional explicit init and more pure optimizer steps

* move learning rate to state

* add lr to opt state, some fixes in capture

* fix optim

* update tuple of containers as well

* fix stream for compiled output

* rng state for compile

* nit

* updates and comments

---------

Co-authored-by: Angelos Katharopoulos <a_katharopoulos@apple.com>

docs/src/python/nn/module.rst

@@ -11,6 +11,7 @@ Module
       :toctree: _autosummary
    
       Module.training
+      Module.state
    
    .. rubric:: Methods