feat: embeddings comparison and heat matrix

[massi-ang]

Issue #, if available:
Fixes #109

Description of changes:

• Implemented a multiselect in the embeddings UI to allow the user to select 1 or more embeddings
• Display the similarity matrixes and the embedding vectors for all the embedding models
• Allow for quick copy to clipboard of embeddings
• Implements a switch to show all the result compared to the first input only
• Only shows half of the matrix similarity scores are

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.