Draft: Add ability to search for similar images

[sazarkin]

This is POC for similarity search inspired by this PR #2005

What it does:

• Uses TensorFlow CLIP (ViT-B-16) model to create embeddings ([512]float32) vector and stores it db
• Uses FAISS https://github.com/facebookresearch/faiss library to maintain in-memory index for this embeddings. Because MariaDB does not support yet index like this.
• Adds UI screen to show similar images

Saved CLIP model: https://www.dropbox.com/scl/fi/7dg71dr5qjwscmwt13x60/assets-clip.tar.gz?rlkey=5u7ve354auuqcd6dr0gg0b1b2&dl=1

What it can do:

• Use this embedding for text search as proposed in Search: Find image content using CLIP #1287 #2005
• Upload any image like google images to search

UI is not in very good state, index init is just inserted at the start command, libfaiss is not added into docker image.
This is not in ready state, and I want to receive comments if this approach even desirable in upstream.

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[graciousgrey]

Thank you very much for that! We will review it and give you feedback as soon as we have finalized our next stable release :)