Group multi-file suggestions to be automatically batched

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Situation

Sometimes you want to

• make the same change in multiple files
• or a change affects multiple different locations

it would be nice to indicate that certain changes are related

Possible solution

This could be indicated via a new code fence info string attribute

```suggestion:+0-0 group=use-this-class-and-import-it
import MyClass from 'src/MyClass'
```
…
```suggestion:+0-0 group=use-this-class-and-import-it
myClass = new MyClass
```

The UI needs to indicate that the suggestion is part of a group and offer to apply them all together

Furthermore, the UI could offer a view to show all the suggestions of one group together (maybe the new right-hand drawer? 🤔)