debug : include LLAMA_POOLING_TYPE_UNSPECIFIED in pooling check (#18692)

debug : include LLAMA_POOLING_TYPE_UNSPECIFIED in pooling check (#18692)

* debug : include LLAMA_POOLING_TYPE_UNSPECIFIED in pooling check

This commit updates the pooling check in the debug example to
also include LLAMA_POOLING_TYPE_UNSPECIFIED and not just
LLAMA_POOLING_TYPE_NONE.

* debug : normalize both pooled and token embeddings

This commit updates debug.cpp to normalize embeddings for both pooled
and non-pooled outputs. For pooled embeddings, normalization is applied
to the single vector, and for non-pooled embeddings, normalization is
applied to each token embedding vector individually.

The motivation for this is to enable non-pooled embeddings to be
normalized which was not possible previously.