Add Dimension Parameter to Azure OpenAI Vectorizer Client

[Barabanga]

The Azure OpenAI vectorizer lacks the dimension parameter (configure-the-vectorizer), which allows the use of custom dimensions for the embeddings it generates.
This feature seems to have already been implemented in Weaviate: weaviate/weaviate#5987.

[AlexMiasoiedov]

Same problem here. We're migrating embeddings with dimension 3072 from pgvector and getting error – distance between entrypoint and query node: 3072 vs 1536: vector lengths don\'t match.
Model: text-embedding-3-large