Extend duotone supports with exception to not render controls.

[wwdes]

What problem does this address?

Currently when developing custom blocks that may use duotone filters, one has to opt in to duotone supports to benefit from global optimizations, but this renders opinionated controls, severely limiting custom implementations.

What is your proposed solution?

Extend the duotone supports with an exception flag that will skip rendering controls and let the developer handle implementation of controls and attribute updates.