Command to locally test trigger/output(s) of an individual function

_New Feature - Looking for votes and/or user input to gauge traction._

Wanting to add new CLI commands that will make testing bindings easier. Ex: when testing a queue-triggered function, want to have a `func` insert message to relevant queue instead of having to use storage explorer or azure portal or any other method. This would be pretty light-weight (a small wrapper on the relevant SDK's), but could know how to consume a function app's connection strings and other function.json metadata. Unclear if we also want commands for checking outputs, or if that's baked in to the func CLI command (perhaps optional key value pairs on expected values for output bindings)

(For inside the team, this would also be very useful for better automated end-to-end tests.)