CupertinoTextSelectionToolbar is different from the native one, with some UI and UX issues. More details on the linked issue.

https://github.com/flutter/flutter/issues/127756

Currently the only problem that I listed on the linked issue that I couldn't fix was the horizontal scrolling, but to workaround this I added a GestureDetector to change pages when swiping the toolbar. It's not exactly the same as native as there is no scroll animation, but it works.

I'm creating this PR a little early to have some feedback as these changes were more complex than the ones in my last PR. Probably best if @justinmc is involved 😅

|Version|Video|
|-|-|
|Flutter Old|<video src="https://github.com/flutter/flutter/assets/12024080/7cf81075-46ec-4970-b118-cc27b60ddac0"></video>|
|Flutter New|<video src="https://github.com/flutter/flutter/assets/12024080/c9e27a53-f94c-4cb0-9b76-e47b73841dcb"></video>|
|Native|<video src="https://github.com/flutter/flutter/assets/12024080/468c7d5b-ba93-4bd4-8f6e-8ec2644b9866"></video>|