model-conversion : add model card template for embeddings [no ci] (#15557)

* model-conversion: add model card template for embeddings [no ci]

This commit adds a separate model card template (model repository
README.md template) for embedding models.

The motivation for this is that there server command for the embedding
model is a little different and some addition information can be useful
in the model card for embedding models which might not be directly
relevant for causal models.

* squash! model-conversion: add model card template for embeddings [no ci]

Fix pyright lint error.

* remove --pooling override and clarify embd_normalize usage

examples/model-conversion/scripts/causal/modelcard.template

@@ -0,0 +1,13 @@
+---
+base_model:
+- {base_model}
+---
+# {model_name} GGUF
+
+Recommended way to run this model:
+
+```sh
+llama-server -hf {namespace}/{model_name}-GGUF -c 0 -fa
+```
+
+Then, access http://localhost:8080