message-params: If message paremeters is not JSON, wrap into JSON string
requested to merge igor.v.kovalenko/pulseaudio:pr/relaxed-message-params-json-requirement into master
Requiring user to invoke send-message with correctly quoted parameters string is not good for usability.
Wrap parameters string into JSON string and try again. If that works, log a warning use wrapped JSON string with parameters.
As an example these two commands will now invoke the same action:
`pactl send-message /card/bluez_card... switch-codec '"CODECNAME"'`
`pactl send-message /card/bluez_card... switch-codec CODECNAME`