Automatically wire in reducers and sagas for newly created views.

[jayantbh]

Is your feature request related to a problem? Please describe.
When I create a new view, I need to manually integrate the sagas and the reducers into src/sagas.js and src/reducers/index.js.

Describe the solution you'd like
It would be great if terrace could automatically do that for me.

Describe alternatives you've considered
An alternative would be to document the fact that you need to manually add these files in, if automatic code addition isn't very possible.

Additional context
Would need to look into AST transforms I guess.