Validate tasktype in workflow definition

[dcore94]

I've spent 3 hours trying to understand why my task did not get delivered even if correctly polled.
At the end the problem was that unfortunately i wrote the type as "simple" instead of "SIMPLE" in the workflow definition.
It shouldn't be hard to validate this or make it case insensitive, is it?
Thanks.

[apanicker-nflx]

Yep, we can probably add a validation for this. Since all the other task types can required to be upper-case, lets keep this case sensitive for now, but we can look into removing this restriction across all task types in the future.