Add SVG support for Card Cover

**Is your feature request related to a problem? Please describe.**
We can not add an SVG as Card Cover: https://callstack.github.io/react-native-paper/docs/components/Card/CardCover.

Event with this library it does not works: https://www.npmjs.com/package/react-native-svg
It gives this error: `TypeError: cyclical structure in JSON object`

**Describe the solution you'd like**
It will be great to support with a props names SVG like:

` }} />`

从 Card.Cover 组件及其文档中说明的 source API 开始，然后将报告的行为与 react-native-svg 以及链接的 SVG 示例进行比较。在决定应如何接受 SVG 内容之前，确认现有 source 值的处理方式。完成标准是 SVG 封面能够渲染且不再出现循环结构错误，同时现有的 Card Cover 用法继续正常工作。

由索引模型根据 Issue 内容生成。