slide syntax should support `[import:1]`

Currently, support following patterns.

```
All: [import, hello-world.js](../src/hello-world.js)
1-2: [import:1-2, hello-world.js](../src/hello-world.js)
2-3: [import:2-3, hello-world.js](../src/hello-world.js)
2>=: [import:2-, hello-world.js](../src/hello-world.js)
<=3: [import:-3, hello-world.js](../src/hello-world.js)
```

We want to add following pattern:

```
1: [import:1, hello-world.js](../src/hello-world.js)
```

It is a alias of that

```
1: [import:1-1, hello-world.js](../src/hello-world.js)
```

先找出處理 issue 中所示現有匯入範圍形式的 parser 或測試。為 [import:1] 新增覆蓋，並確認它的行為與 [import:1-1] 相同，包括預期包含的行。

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