Implement CLIENT REPLY command

[mvelimir]

Overview

The library is missing the CLIENT REPLY command from the connection API. The current implementation of the RedisExecutor will need to be modified in order to support the functionality of this command.

Tips

• API should be defined in zio.redis.api.Connection.
• Command-specific options should be defined in zio.redis.options.Connection.
• Additional inputs and outputs can be defined in zio.redis.Input and zio.redis.Output, respectively.
• Write inputs and outputs tests in zio.redis.InputSpec and zio.redis.OutputSpec, respectively.
• Write integration tests by expanding the zio.redis.ApiSpec.
• Implement commands in the TestExecutor.