Require executor name when calling scheduleWithFixedDelay

The ThreadPool#scheduleWithFixedDelay method does not make it clear that all scheduled runnable instances
will be run on the scheduler thread. This becomes problematic if the actions being performed include
blocking operations since there is a single thread and tasks may not get executed due to a blocking task.

This change includes a few different aspects around trying to prevent this situation. The first is that
the scheduleWithFixedDelay method now requires the name of the executor that should be used to execute
the runnable. All existing calls were updated to use Names.SAME to preserve the existing behavior.

The second aspect is the removal of using ScheduledThreadPoolExecutor#scheduleWithFixedDelay in favor of
a custom runnable, ReschedulingRunnable. This runnable encapsulates the logic to deal with rescheduling a
runnable with a fixed delay and mimics the behavior of executing using a ScheduledThreadPoolExecutor and
provides a ScheduledFuture implementation that also mimics that of the typed returned by a
ScheduledThreadPoolExecutor.

Finally, an assertion was added to BaseFuture to detect blocking calls that are being made on the scheduler
thread.

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