Info module : pipeline RGB transform visualization

Is your feature request related to a problem? Please describe.

Agx is coming and is frightening but I would like to use it. Filmic is awesome and the response curve that allow you to understand what's happening is a major feature. It got me thinking that it can be interesting info for all modules.

Describe the solution you'd like
Two things.

Per module viz
Every module has buttons for reset, preset, instance management, etc. Or a subsection for mask. Functions that every module has. I would like a new function that all the module should have.

For each canal (RGB) this function will display a curve that is the sum of the three canals vs luminosity. So a total of three curves (RGB output of the modules), each of them constructed visually on three other curves (RGB input).

Optionally it could display the input and output images.

General viz
Another info tool, maybe on the left, would display the same thing but got the entire pipeline, just after the raw decode until the final render.

Start by locating the existing Filmic response-curve visualization and the shared controls present on each module. Compare how module-level and whole-pipeline processing are represented, then define how RGB input and output curves would be shown and how completion would be verified for both visualization scopes.