Recreate event service if WithNoCache() opt used

[vadiminshakov]

This PR adds WithNoCache() func opt to the event client constructor to force reinitialization of event client instead of using an event client from cache.

Now two different event clients will be created with the same EventService if the same context.ChannelProvider (New(channelProvider context.ChannelProvider, opts ...ClientOption)) was passed. As a result, the passed functional options are ignored.

Example of undocumented behaviour:

eventClient1, err := event.New(chPrvdr, event.WithBlockEvents(), event.WithSeekType(seek.FromBlock), event.WithBlockNum(0))
...
eventClient2, err := event.New(chPrvdr, event.WithBlockEvents(), event.WithSeekType(seek.FromBlock), event.WithBlockNum(10))

eventClient2 will listen not from 10 block, but from 0. Expected behavior: the client will listen from the 10 block.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kopaygorodsky]

It was fixed in #184

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.