[Model] Add Afmoe architecture implementation (#28332)

Signed-off-by: Maziyar Panahi <maziyar.panahi@iscpif.fr>
Signed-off-by: Pranav <veldurthipranav@gmail.com>
Co-authored-by: Maziyar Panahi <maziyar.panahi@iscpif.fr>

tests/models/registry.py

@@ -173,6 +173,10 @@ class _HfExamplesInfo:
 
 _TEXT_GENERATION_EXAMPLE_MODELS = {
     # [Decoder-only]
+    "AfmoeForCausalLM": _HfExamplesInfo(
+        "arcee-ai/Trinity-Nano",
+        is_available_online=False,
+    ),
     "ApertusForCausalLM": _HfExamplesInfo("swiss-ai/Apertus-8B-Instruct-2509"),
     "AquilaModel": _HfExamplesInfo("BAAI/AquilaChat-7B", trust_remote_code=True),
     "AquilaForCausalLM": _HfExamplesInfo("BAAI/AquilaChat2-7B", trust_remote_code=True),