Redesign IUpdateManager interface and implementation

[tuscen]

Scoped lifetime of IUpdateManager<TBot> and polling functionality built in it don't play well together. An entity that performs polling should be a singleton.

IUpdateManager<TBot> functionality should be split to two interfaces:

• IUpdateDispatcher<TBot> that performs dispatching and could has either scoped or transient lifetime
• An entity that performs actual polling and has dependency on a factory that creates IUpdateDisptacher<TBot> instance and has singleton lifetime so it correctly incapsulates update offset