model : add AfmoeForCausalLM support (#16477)

model : add AfmoeForCausalLM support (#16477)

* Add AFMOE model support

* Update to vocab

* Add model sizing

* Undo Rope change for ARCEE model

* Address review comments

* Update modeling code is_sliding -> use_rope, replace hard-coded logic

* Fix AFMOE tokenizer

* Update convert_hf_to_gguf.py

Co-authored-by: Sigbjørn Skjæret <redacted>
* Update convert_hf_to_gguf.py

Co-authored-by: Sigbjørn Skjæret <redacted>
* Update AFMoE tokenizer class identification to be more unique

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Co-authored-by: Sigbjørn Skjæret <redacted>