Don't highlight lifecycle hooks as "declared but never read"

[OBrown92]

VSCode mentioned lifecycle hooks as "declared but never read".

It would be nice if the lifecycle hooks would be properly handled and maybe autocompleted as well.

[ewanharris]

I think as those are from the TS language service in VS Code we can't touch them as it stands today.

I think the way we'd have to solve this is to write a TS language plugin and add that as part of the contribution points of the extension (docs), I'm not familiar with TS plugins but I guess we could then inform TS that the function is unused somewhere.