Motivation:

The SSWG has identified a fast approaching reality of namespace clashes in SPM within the ecosystem and has proposed a rule on names that `NIORedis` no longer complies with.

Modifications:

All references to `NIORedis` have been switched to `RedisNIO` as this module name is unique (at least within GitHub's public repositories).

The goals for this name are as follows:

1. To indicate that this is a Redis client library that is built with SwiftNIO
2. That it is a lower level library, as it directly exposes SwiftNIO as an implementation detail
    2a. The idea being that a higher level library (`Redis`) will be used, and to "go one level deeper" in the stack, you append the "deeper" `NIO` postfix
3. It follows a naming pattern adopted by Vapor who has expressed their desire to adopt this library as their Redis implementation

Result:

A repository, package name, and module name that are unique across GitHub's public repositories that achives the goals outlined above.