Enable LSP go to definition on string literals

[dibarbet]

Resolves #56765

[JoeRobich]

I feel like this change should be made to Go to Type Definition instead. Literals are defined at their location and this is instead going to the literal's type.

[dibarbet]

I feel like this change should be made to Go to Type Definition instead. Literals are defined at their location and this is instead going to the literal's type.

go to type definition does work for that already (no change needed). Happy to say someone should use go to type definition instead, but I also don't mind if go to definition also supported this (also makes it work in VS Razor which doesn't have go to type def)