py : fix StableLM conversion after config.json changes (#5703)

* Fix issues during StableLM models conversion

* Fix hard coded layer_norm_eps

* Support layer_norm_eps for LlavaStableLM

Co-authored-by: Jared Van Bortel <cebtenzzre@gmail.com>

* Add missing parenthesis

Co-authored-by: Jared Van Bortel <cebtenzzre@gmail.com>

* Support rotary_factor for LlavaStableLM

Co-authored-by: Jared Van Bortel <cebtenzzre@gmail.com>

* fix typo

* Add StableLMEpochForCausalLM for safety

Co-authored-by: compilade <113953597+compilade@users.noreply.github.com>

* Add StableLMEpochForCausalLM for safety 2

Co-authored-by: compilade <113953597+compilade@users.noreply.github.com>

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Co-authored-by: Jared Van Bortel <cebtenzzre@gmail.com>
Co-authored-by: Jared Van Bortel <jared@nomic.ai>
Co-authored-by: compilade <113953597+compilade@users.noreply.github.com>