XD-2061 Add Redis sink module

 - Add Redis sink with the following options:
    - topic (a SpEL expression)
    - hostname, port and password
Hmmm, on second thought, should really add the logic that goes from literal -> expression before invocation of that method. Else, imagine there is default value for the literal (say, in modules.yml), then when you do module info, you wouldn't see it.