Новая команда `picodata plugin` и подкоманда `picodata plugin configure`

Picodata follow-up

• Follow-up for cli command to reconfigure plugin services configs (picodata!1389 - merged)
• See also Load plugin service configuration from it's con... (picodata#705 - closed)
• Doc pages to change: https://docs.picodata.io/picodata/stable/reference/cli