feat(switch): 支持 circle/round/line 三种 shape - #4342
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type.ts 和 defaultProps.ts 加了 shape 属性，默认 circle。 Switch.tsx 的改动： - contentNode 在 line 形态返回 null，不渲染 content DOM - 加了 derivedAriaLabel，line 形态从 label 推导 aria-label - className 加了 shape 修饰 - 补了 aria-checked 和 aria-disabled - content div 在 line 形态不渲染 样式在 tdesign-common 仓库提，对应 PR Tencent#2651。 issue Tencent#2563
rerender 不会重置 state，click 后 innerChecked 仍为 true， 用独立 render 测试默认值 '已关闭'
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对应 issue tdesign-common#2563，给 Switch 加了 shape 属性，支持 circle（默认）、round、line 三种。
组件侧的改动：
type.ts 加了 shape?: 'circle' | 'round' | 'line'，defaultProps 默认值 circle。
Switch.tsx 做了这些：
测试覆盖了 shape 切换、line 不渲染 content、aria-label 推导、aria-disabled、aria-checked。
样式部分在 tdesign-common 仓库，对应 PR tdesign-common#2651。