d0058ec361
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previous https://github.com/flutter/flutter/pull/167363
I have to factor out abstract class for RadioGroupRegistry and
RadioClient which are subclassed by RadioGroupState and RawRadio
respectively.
I have to do this because the RadioListTile that has 2 focusnode one for
listTile and one for the radio it builds. The issue is that RadioGroup's
keyboard shortcut has to tightly couples with the focus node of each
radio, but the radioListtile has to mute the radio's focusnode so it can
act as one control under keyboard shortcut
d582b35809/packages/flutter/lib/src/material/radio_list_tile.dart (L484)
Therefore i abstract the out the logic of RadioGroup so that another
widget can participate by implementing the interface.
fixes https://github.com/flutter/flutter/issues/113562
migration guide: https://github.com/flutter/website/pull/12080/files
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