add a language or component for "Terminal" code snippets

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follow-up to https://github.com/aws-amplify/docs/pull/7391

Create a terminal component or language that sets defaults of "title" and "showLineNumbers" on code blocks.

**Describe the solution you'd like**
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````
```terminal
npm run dev
```
````

**Describe alternatives you've considered**
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```mdx

npm run dev

```

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