Omit JSDoc type directives when emitting type declarations with documentation

まだ誰も着手していません。

### 🔍 Search Terms

"omit typedef", "exclude typedef"

### ✅ Viability Checklist

- [x] This wouldn't be a breaking change in existing TypeScript/JavaScript code
- [x] This wouldn't change the runtime behavior of existing JavaScript code
- [x] This could be implemented without emitting different JS based on the types of the expressions
- [x] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- [x] This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
- [x] This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

### ⭐ Suggestion

When emitting type declarations from JavaScript sources, the type is already defined in the TypeScript syntax, so there's no need to copy over any `@type`, `@typedef`, or `@template` directives.

Types can also be stripped out of `@param` and `@returns` directives.

This could be taken further, by deleting JSDoc strings altogether if after stripped the types, they become empty.

### 📃 Motivating Example

For example, I have the following files:

**`css-select-adapter.js`**

```js
/**
* @param {Map} parents
* @returns {Required>['adapter']}
*/
export function createAdapter(parents) {
// …
}
```

**`tsconfig.json`**

```json
{
"extends": "./tsconfig.json",
"compilerOptions": {
"noEmit": false,
"declaration": true,
"emitDeclarationOnly": true,
"outDir": "types/"
},
"include": ["lib/svgo-node.js", "lib/svgo.js"]
}
```

The emitted type declaration is:

```ts
/**
* @param {Map} parents
* @returns {Required>['adapter']}
*/
export function createAdapter(parents: Map): Required>["adapter"];
```

But the types defined in the JSDoc become unnecessary since it's already defined in TypeScript, so it should just be:

```ts
/**
* @param parents
* @returns
*/
export function createAdapter(parents: Map): Required>["adapter"];
```

This could be taken further, by removing the `@param`, `@returns`, and `@template` directives if all of them have no value, and removing the JSDoc outright if after removing empty directives the JSDoc becomes empty:

```ts
export function createAdapter(parents: Map): Required>["adapter"];
```

### 💻 Use Cases

In SVGO, we emit type declarations from our JSDocs. However, the type declarations can be quite noisy. It would be valuable if the output was tidied up:

1. To make them quicker/easier to human-review when needed.
2. Reduce the size of the published npm package.

We currently do not do any workarounds. We just publish the additional content to npm.

css-select-adapter.js と示されている tsconfig.json を使って宣言のみの出力を再現し、JSDoc が生成された宣言にどのように引き継がれるかを追跡する。@type、@typedef、@template、@param、@returns に対してサポートする stripping の動作を定義し、空のドキュメントを削除する場合も含める。done には、提案された出力とそのエッジケースのカバレッジを含めること。

索引モデルが issue の本文から書いたものです。