feat: mouseWheelSensitivityX and mouseWheelSensitivityY options

[lfagundes]

When I set enableMouseWheelScrollHandler, the mouse wheel sensitivity increases a lot. To fix that, I put these constants that were already being used as options.

In my first experiments, 3 would be a better default value for both. It's closer to the sensitivity when enableMouseWheelScrollHandler is false, and more ergonomic.

[lfagundes]

I ended up not using this code, so not sure if this is relevant or not.

I use a trackball, and in my environment the mouse wheel sensitivity increases when enableMouseWheelScrollHandler is enabled. But other people had a different experience, and we ended up keeping the default values.

[ghiscoding]

closing since I don't think this is needed and the codebase changed a lot since then and will change even more when Roadmap to v4.0 is soon to be released