feat: support customize theme

[likui628]

General

closes #95

✏️ Mark the necessary items without changing the structure of the PR template.

1. 抽取公共函数，可以支持不同的框架。

<a-config-provider
    :theme="{
      algorithm: theme.darkAlgorithm,
    }"
  >
    <a-button />
 </a-config-provider>

// 变量使用
import { theme } from 'ant-design-vue';
const { useToken } = theme;
const { token } = useToken();

<n-config-provider :theme-overrides="themeOverrides">
  <my-app />
</n-config-provider>

// 变量使用
import { useThemeVars } from 'naive-ui'
const themeVars = useThemeVars()

2. 工具addCssVarsToHtml函数，将CSS变量值添加到DOM上，方便的引用颜色值

3. 需要设置5种不同的颜色：

- primary色
- info色
- success色
- warning色
- error色

渐变色生成
https://github.com/ant-design/ant-design-colors

// Generate color palettes by a given color
const colors = generate('#1890ff');

// Generate dark color palettes by a given color
const colors = generate('#1890ff', {
  theme: 'dark',
  backgroundColor: '#141414',
});

4. 参考

1. Naive UI 动态自定义换肤实现
2. Ant Design Vue - Customize Theme
3. Naive UI - Customizing theme
4. Theme Editor

• Pull request template structure not broken

Type

ℹ️ What types of changes does your code introduce?

👉 Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

ℹ️ Check all checkboxes - this will indicate that you have done everything in accordance with the rules in CONTRIBUTING.

👉 Put an x in the boxes that apply.

• My code follows the style guidelines of this project
• Is the code format correct
• Is the git submission information standard?
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[likui628]

效果图，此次PR目前只做到支持主题换色