Add dynamic dimensions capability to GPT Embeddings models

[converseKarl]

Apparently this can optimize the cost, performance whilst still out performing ada and small gpt models. Adding this will bake in flexibility for future.

See note below

https://platform.openai.com/docs/guides/embeddings/use-cases

[adhityan]

Not all embedding models support dynamic dimensions. I have added it to the OpenAi3LargeEmbeddings model. Simply set the optional parameter dynamicDimension in the constructor. We can also add it to any other embedding model that supports this.

Will be available in the next version published.

[adhityan]

Included in version 0.0.73