Dynamic top Appbar background color

**Is your feature request related to a problem? Please describe.**
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**Describe the solution you'd like**
Hi! I would like the top Appbar background to behave according to [this MD3 guideline](https://m3.material.io/components/top-app-bar/guidelines#4eab4f50-4a3e-4189-bce2-a46514cde1da):

https://github.com/callstack/react-native-paper/assets/56068232/48ac7a36-e03b-42ac-b437-97e4c8c209ad

**Describe alternatives you've considered**
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**Additional context**
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首先定位顶部 Appbar 组件及其现有的 background-color 行为，然后将其与链接的 Material Design 3 指南和附带示例进行比较。当顶部 Appbar 的背景根据该指南发生变化，并且在该组件有测试的情况下为产生的行为添加 coverage 时，即表示完成。

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