feat: add Connected Button Group

According to the specs, the SegmentedButton is deprecated and replaced by Connected Button Group.

- Implement the new component according to specs: https://m3.material.io/components/button-groups/overview
- Reuse newly introduced tokens (shape, motion, typography, color etc)
- Extract component specific tokens for easier maintenance.
- Get inspired from TextInput/TextField, Switch, Checkbox, FAB components which have gone through modernization.

Related tasks:
- https://github.com/callstack/react-native-paper/issues/4936
- https://github.com/callstack/react-native-paper/issues/4928 (has a PR open already and we should reuse logic from there in this new component)

从 Material 3 Button Groups 规范和相关 issue #4928（包括其开放的 pull request）开始，以确定可复用的逻辑。然后，查看 TextInput/TextField、Switch、Checkbox 和 FAB 中的现代化模式。当按照规范实现 Connected Button Group 组件，并包含相关的共享 token 和组件专用 token 时，即视为完成。

由索引模型根据 Issue 内容生成。