[Feature] Allow external interactor to hook into VolumeMapper `autoAdjustSampleDistances`

[daker]

Motivation

In order to provide the autoAdjustSampleDistances, the VolumeMapper needs to provide a way to allow the tool to provide the information needed instead of relaying on RWI onAnimationFrameRateUpdate subscription.

https://github.com/Kitware/vtk-js/blob/master/Sources/Rendering/OpenGL/VolumeMapper/index.js#L1214-L1289

Detailed Description

Cornerstone3D doesn't use RWI, instead it uses its own tool.

To enable autoAdjustSampleDistances, the VolumeMapper should expose or implement a mechanism that allows Cornerstone3D’s internal interaction tool to supply the required information.

[daker]

@finetjul hi, if you have an idea how this can be implemented i can propose a PR.

[finetjul]

I can see 3 options here:

• create a CornerStoneRWI that implements what the mapper needs
• have CornerStone manually set imageSampleDistance on the mapper.
• move the "autoAdjust" logic code into a helper class (see CoincidentTopologyHelper), that way other mappers can also use it and that helper class can be overwritten by CornerStone.