Make `RedisKey` `ExpressibleByStringInterpolation`

George Barnettrequested to merge
georgebarnett/RediStack:gb-redis-key-interpolation into master

Motivation:

RedisKey is ExpressibleByStringLiteral but not ExpressibleByStringInterpolation which is often just as useful.

Modifications:

  • Add ExpressibleByStringInterpolation conformance to RedisKey

Result:

Users can create RedisKeys using string interpolation

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