feat(redis): Allow configuring Redis pools individually #3859
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Second attempt at #3843. Implements #3829.
This time around, if there is only one Redis pool configuration, we only create one pool and clone it 4 ways (instead of creating 4 identical pools like last time). This means that the case of only one configuration preserves the current behavior, modulo the bug fix related to
DEFAULT_MIN_MAX_CONNECTIONS
.