Add static property for default RedisConnection port
Motivation: The default port for Redis is well published to be 6379, and it is common to want to pass this value around or use it as a static default value in methods and initializers. Modifications: Add `RedisConnection.defaultPort` static property for all users to use, and update references of the `6379` literals to use new the new property. Result: Users should have a reliable default defined to use everywhere to avoid bugs.
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