Fixes MultiCodeBlock highlighting consistency issue

[BlenderDude]

Highlighting line consistency was lost during the TS->JS transpilation.

```ts {2}
type Result = void;
const test = (): Result => {};
test();
```

In the old system, line 1 would be omitted in the JS output, leaving test() to be highlighted. This was incorrect behavior and is adjusted with this new system to track line highlights.

More can be seen in the tests of the remark-typescript project remark-typescript

Screen.Recording.2022-08-11.at.4.32.03.PM.mov

The above video properly shows the new highlighting adjustment. Note how the interface is highlighted in TS, and is now properly adjusted for and collapsed for JS.

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[StephenBarlow]

Seems to work correctly from where I'm sitting!

[trevorblades]

Great work @BlenderDude! Just noticed a few things and left some comments/suggestions. Let me know if that all makes sense 🙇

[trevorblades]

LGTM! 🍣