Refactor internally to use sendCommandAsRESP throughout

[kjessup]

from @sportlabsMike

"Perhaps in time the library can be refactored internally to use sendCommandAsRESP throughout"

"The library currently sends commands in the 'inline' format rather than using the REdis Serialization Protocol (see docs ). The 'inline' approach has a much smaller limit than RESP in terms of the size of the data that can be sent in for example a SET command.

By adding public func sendCommandAsRESP these limits can be avoided when necessary.

Perhaps in time the library can be refactored internally to use sendCommandAsRESP throughout, but I don't currently have time to do this."