Feature lease keep alive with cancellation token source

[luboid]

Hi
I'm trying to build a distributed lock and I need a LeaseKeepAlive method with CancelationTokenSource parameter

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[shubhamranjan]

Thank you for your contribution 💯 . I will do a few more tests and release it in the next few days.

[luboid]

Thank you

[luboid]

Hi,
You can make a little change if you want, I do not want to open a new pull request
change signature of KeepAliveAsync to

Task KeepAliveAsync(object state)

and then it can be used like that

            return Task.Factory.StartNew(
                KeepAliveAsync,
                null,
                cancellationToken,
                TaskCreationOptions.LongRunning,
                TaskScheduler.Current)
                .Unwrap();

sorry if I bother you