flutter_improved_scrolling

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This PR brings:

• fix: scroll becomes slow when scroll quickly (scroll multiple times in seconds).
• feat: add trackpad support. currently trackpad not working when use custom scroll.

BREAKING CHANGES:

since flutter have upgraded to 3.3, which moves events for trackpad from emulated gesture event to its own scroll event. This new logic to fits the latest version of flutter stable, and provided a fix to support trackpad on flutter 3.3+.

After merge this, flutter which version <3.3 cannot successfully compile this pub because it uses the latest interfaces added by flutter 3.3.