Support simulated input data

Expansion of #54:

Support simulation of data received on any active input adapter. Inject user-supplied data into the pipeline as if it came from another input adapter. e.g., simulate a bot command of !item "item" from the console

Depending on the input adapter being simulated, require other context/meta - e.g., a world context, a source user ID, etc.

Send output to simulation channel on all enabled output adapters.