Something is definitely wrong with <ThemeProvider>'s typings 👀

## Description

BTW i don't really understand what for this component is needed
Everything seems to work fine even without it

withTheme() HOC kinda provides theming 🤷🏼‍♂️

## Reproducible Demo

I've reproduced this issue on CodeSandbox
Come check that out 👇

[sandbox 🎁](https://codesandbox.io/s/theme-provider-issue-n602nb)

从链接的 CodeSandbox 复现开始，检查其中展示的 ThemeProvider typings 和用法。确认哪种 typing 行为是不正确的，并在进行任何更改之前定义预期的 ThemeProvider 用法；当复现不再报告 typing 问题时，该 issue 即完成。

由索引模型根据 Issue 内容生成。