Collapse unchanged lines in suggestions

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Situation

Sometimes, you want to make a suggestion where you change two lines at opposite ends of a files within the same suggestion. Currently, this results in a very large diff, the assignee has to wrap their head around.

This leads to solutions like

• Creating multiple suggestions in different comments
• Add textual instructions with additional chores to the suggestion

This is all not very ideal as it can lead to partially applied changes that will result in the pipeline failing, which may not be obvious to the assignee

Solutions

• Automatically collapse unchanged lines

1 import A from 'a'
+ import B from 'b'
…
25 a = new A();
+ b = new B();

• Denote relevant lines

```suggestion lines="1"
import A from 'a'
import B from 'b'
```
```suggestion lines="2"
a = new A();
b = new B();
```

Part of &832