fix: add undefined to optional className properties (fixes #1143)

[junhaoliao]

With a reference to https://www.github.com/DefinitelyTyped/DefinitelyTyped/pull/54352, this PR addresses a TypeScript error that occurs when using rc-select with CSS Modules in a Vite project with exactOptionalPropertyTypes: true enabled.

Summary by CodeRabbit

• 重构
  • 此次更改显式地在 BaseSelectProps 接口和 BaseOptionType 接口中将 className 和 popupClassName 两个可选字符串属性的类型声明从隐式的可选（string 或未声明）改为显式包含 undefined（string | undefined）。这些修改仅调整了类型注解的明确性，不影响运行时行为或逻辑。

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[coderabbitai]

## Walkthrough
此次更改显式地在 `BaseSelectProps` 接口和 `BaseOptionType` 接口中将 `className` 和 `popupClassName` 两个可选字符串属性的类型声明从隐式的可选（`string` 或未声明）改为显式包含 `undefined`（`string | undefined`）。这些修改仅调整了类型注解的明确性，不影响运行时行为或逻辑。

## Changes
| 文件                           | 更改说明                                                                                  |
|------------------------------|-------------------------------------------------------------------------------------------|
| `src/BaseSelect/index.tsx` 和 `src/Select.tsx` | 在接口 `BaseSelectProps` 和 `BaseOptionType` 中，将 `className` 和 `popupClassName` 属性的类型由隐式可选的 `string` 改为显式包含 `undefined` 的 `string | undefined`。 |

## Possibly related PRs
- **react-component/select#1133**: 此 PR 同样涉及对 `BaseSelectProps` 接口的更新，直接修改了属性声明，与本次改动存在代码层面的联系。

## Suggested reviewers
- zombieJ

## Poem
> 我是小兔跳跃忙，  
> 代码更新乐无疆，  
> 类型声明更明确，  
> 细节变化藏光芒，  
> 小改动也辉煌，  
> 跟我一起欢歌唱！ 🐇

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src/Select.tsx

Oops! Something went wrong! :(

ESLint: 8.57.1

Error: Cannot read config file: /.eslintrc.js
Error: Cannot find module '@umijs/fabric/dist/eslint'
Require stack:

• /.eslintrc.js
• /node_modules/.pnpm/@eslint[email protected]/node_modules/@eslint/eslintrc/dist/eslintrc.cjs
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/cli-engine/cli-engine.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/eslint/eslint.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/eslint/index.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/cli.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/bin/eslint.js
  at Module._resolveFilename (node:internal/modules/cjs/loader:1248:15)
  at Module._load (node:internal/modules/cjs/loader:1074:27)
  at TracingChannel.traceSync (node:diagnostics_channel:315:14)
  at wrapModuleLoad (node:internal/modules/cjs/loader:217:24)
  at Module.require (node:internal/modules/cjs/loader:1339:12)
  at require (node:internal/modules/helpers:135:16)
  at Object. (/.eslintrc.js:1:14)
  at Module._compile (node:internal/modules/cjs/loader:1546:14)
  at Module._extensions..js (node:internal/modules/cjs/loader:1691:10)
  at Module.load (node:internal/modules/cjs/loader:1317:32)

src/BaseSelect/index.tsx

Oops! Something went wrong! :(

ESLint: 8.57.1

Error: Cannot read config file: /.eslintrc.js
Error: Cannot find module '@umijs/fabric/dist/eslint'
Require stack:

• /.eslintrc.js
• /node_modules/.pnpm/@eslint[email protected]/node_modules/@eslint/eslintrc/dist/eslintrc.cjs
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/cli-engine/cli-engine.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/eslint/eslint.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/eslint/index.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/lib/cli.js
• /node_modules/.pnpm/[email protected]/node_modules/eslint/bin/eslint.js
  at Module._resolveFilename (node:internal/modules/cjs/loader:1248:15)
  at Module._load (node:internal/modules/cjs/loader:1074:27)
  at TracingChannel.traceSync (node:diagnostics_channel:315:14)
  at wrapModuleLoad (node:internal/modules/cjs/loader:217:24)
  at Module.require (node:internal/modules/cjs/loader:1339:12)
  at require (node:internal/modules/helpers:135:16)
  at Object. (/.eslintrc.js:1:14)
  at Module._compile (node:internal/modules/cjs/loader:1546:14)
  at Module._extensions..js (node:internal/modules/cjs/loader:1691:10)
  at Module.load (node:internal/modules/cjs/loader:1317:32)

---

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Configuration used: CodeRabbit UI
Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 55e35d6 and 86787f5.

📒 Files selected for processing (2)

• src/BaseSelect/index.tsx (2 hunks)
• src/Select.tsx (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• src/BaseSelect/index.tsx

🔇 Additional comments (1)

src/Select.tsx (1)

93-93: 修复了 TypeScript 类型定义，使其更加明确。

通过将 className 的类型从隐式的可选 string 更改为显式的 string | undefined，此更改解决了在启用 TypeScript 的 exactOptionalPropertyTypes: true 编译器选项时出现的类型错误。这是一个好的修复，因为它不会影响运行时行为或逻辑，但提高了与特定 TypeScript 配置的兼容性。

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (3639a8a) to head (86787f5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1144   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          39       39           
  Lines        1500     1500           
  Branches      453      425   -28     
=======================================
  Hits         1474     1474           
  Misses         26       26           

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[junhaoliao]

@zombieJ 你好，打扰了，方便的时候能否帮忙看一下这个PR的改动？这些更改是参考了https://www.github.com/DefinitelyTyped/DefinitelyTyped/pull/54352 这个PR做的。理论上我们可以针对所有的可选属性加入显式的 undefined 声明，不过我不太确定这样是否改动过多。还请指教，这个PR是否需要包含所有相关的修改？谢谢！