529 UI update llm embedder and vectordb selection pages (#533)

* move llm, embedder, vectordb items to components folder

* add backdrop blur to search in llm, embedder, vectordb preferences

* implement searchable llm preference in settings

* implement searchable embedder in settings

* remove unused useState from embedder preferences

* implement searchable vector database in settings

* fix save changes button not appearing on change for llm, embedder, and vectordb settings pages

* sort selected items in all settings and put selected item at top of list

* no auto-top for selection

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Co-authored-by: timothycarambat <rambat1010@gmail.com>