Only having shape and dataType on Output is unintuitive and hard to find

[rnett]

I just spent an hour or so trying to figure out how to get the build-time shape of a graph operation. Had an issue ready to go and everything. It wasn't until I went poking around in the debugger that I realized it was on Output. I realize that there are design reasons to separate the output from the op, but asOutput() already exists, so I think having shape() and dataType() default methods on Operation that use asOutput is worth it from a usage and discovery standpoint.

[karllessard]

I agree, these should be added to the Operand interface in fact, with a default implementation that fallbacks to asOutput().shape(), for example.

Would you be interested doing it?

[rnett]

Yeah, I can handle it.

[rnett]

Fixed by #153