Add folder selector to create DB and create folder form

[artemmufazalov]

Use existing folders from backend or allow user to create DB in a new folder.

When starting to create entity, it should be not input, but Select with options - folders inside selected path. If user selects any folder, it should be automatically triggered another request and Select should suggest new folders set.
User may not select existing paths, but manually type it's own (like it is working for now).

New component should be reusable.