Move plugin config to separate space

We shall store service configs in a separate place. No need to polute pico_service

DoD:

RFC is changed to reflect changes and changed schema is added
Code is changed to store service configuration elsewhere

RFC discussion: https://docs.google.com/document/d/1QMFXWhrSJ9VLFNX-jayHCzG8jk01VwtOuTOzooBBsOA/edit?disco=AAABLZaHC4w

Edited Jun 10, 2024 by Дмитрий Кольцов

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