Implement convenience method for missing commands

[sebastienfilion]

As a convenience, the RedisRequest constructor has various methods to factorize a RedisRequest object.
For example, RedisRequest.set({}, "hoge", "piyo") instead of RedisRequest("SET", encodeText("piyo"), "hoge").

Up to now, only the "string" commands were implemented. This issue is to track the missing commands; excluding the pub/sub commands. #3

• Cluster commands
• Connection commands
• Geo commands
• Hashes commands
• HyperLogLog commands
• Keys commands
• List commands
• Scripting commands
• Server commands
• Set commands
• Sorted Sets commands
• Stream commands
• Strings commands
• Transactions commands