Reimplement Brightness/Contrast node using the Curves node to reduce code

[jafriyie1]

Closes #1387

[jafriyie1]

@Keavon I ran cargo test and the tests passed. I think this is good to go whenever you are ready!

[0HyperCube]

Looks good

[jafriyie1]

Great thanks @0HyperCube for the review! It looks like the pull request step is failing in the Github Actions related to the Build Graphite Web step. Is there something else that I need to here? Thanks!

For context here is part of the error message:

2023-10-30 14:26:43.974993965 +00:00:00 [WARN] failed to request license information from clearly defined: error sending request for url (https://api.clearlydefined.io/definitions): operation timed out
2023-10-30 14:26:43.975018431 +00:00:00 [WARN] failed to request license information from clearly defined: error sending request for url (https://api.clearlydefined.io/definitions): operation timed out

Could not run `cargo about`, which is required to generate license information.
To install cargo-about on your system, you can run `cargo install cargo-about`.
License information is required on production builds. Aborting.

> print-building-help
> echo 'Graphite project failed to build. Did you remember to `npm install` the dependencies in `/frontend`?'

Graphite project failed to build. Did you remember to `npm install` the dependencies in `/frontend`?```

[Keavon]

As long as you've run the tests which your code influences, you're good. There are other tests in our CI pipeline that are currently failing after we decided to merge a giant refactor before we could fix its tests (not usually desired, but it was needed in this case).

[Keavon]

Hi @jafriyie1, thanks again for this code contribution to the project! We're still hoping you will respond to the request to relicense this code. Please see #4208 ASAP, thank you!