Add: python API method to add custom embeddings

[IgorSusmelj]

What has changed and why?

• Add sample.set_embedding(...) so users can plug in embeddings from their own model instead of the built-in one.
• Add an example script (example_custom_embeddings.py) and a new docs section showing how to use it, including its current limitations (no text search, image/video samples only).
• Add tests covering the new method and the interaction with the embedding plot and search UI.

How has it been tested?

• New unit tests

Did you update CHANGELOG.md?

• Yes
• Not needed (internal change)

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[IgorSusmelj]

This we could also leave away

[IgorSusmelj]

This was refactored. The new status tells us whether we have embeddings and whether we have text embeddings for search. We can later allow the user to hook up their own text encoder model to do also text based search with custom models.