[suggestion] Events listening cancellation

[pesterev]

Feature request

I'd like to have the ability to cancel listening for events.

I see the function signature in that way:

pub fn listen_for_events(
        &self,
        event_filter: FilterBox,
        cancellation_token: CancellationToken, // the token that can cancel listening
) -> Result<impl Iterator<Item = Result<Event>>> {

Motivation

Currently, the client library doesn't provide a way to cancel blocking listening for events by a request. There is only the option to kill a blocked thread.

Who can help?

@Erigara @appetrosyan

[pesterev]

Originally this issue was inspired by a discussion here