Implement functions to wrap Writer or Iterator. The resulting wrapper
provides WriterProvider or IteratorProvider interface respectively.
Such a wrapper can be used as a single storage instance provider
regardless of context.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Implement a component that connects the value stores of the used space of
containers. Implement the Start/Stop operations on it, which will later
become the application handlers of the corresponding events from the
sidechain. The main task of the controller is to temporarily synchronize the
stages of calculating the global estimate of the used space in the
container. The details of the score calculation (the way of collecting /
transmitting local scores, the final score formula and writing to the
contract) are encapsulated in the dependency components, the controller is
abstracted from them.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
