`Tracking` CodeLens

> **Note**
> This is a "meta" issue for tracking purposes since GitHub does not support special types of issues.

CodeLens is a [VS feature](https://learn.microsoft.com/en-us/visualstudio/ide/find-code-changes-and-other-history-with-codelens?view=vs-2022) allowing users to see code references, commit history and so on. It currently supports C# and VB, and we want to implement it for F# as well.

Note that currently we have a feature called CodeLens but it's behavior rather like Inline Hints in C# and will be superseded by [F# Hints](https://github.com/dotnet/fsharp/issues/14157).

Here's the roadmap for F# CodeLens:
- remove the current CodeLens once some F# hints are in place: #14256
- close all the tickets in the Area-LangService-CodeLens and do other cleanup
- implement code references
- implement test coverage