Highlight related keywords under cursor

Prerequisites

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Summary

Some keywords relate to each other, like "break" or "continue" inside a loop statement. It would be nice if these keywords got highlighted when placing the cursor on them just like it happens in VS and VScode when writing C# code. Here's an example:

This makes it easier to tell at a glance which loop I'm breaking out of in a nested loop scenario.

The scenarios that C# covers from my memory are:
1: Obvious pairs (if/else, try/catch/finally)
2: Return statements inside methods
3: Loops and flow control statements

All 3 seem like they would be pretty simple to handle with some AST analysis, however because PowerShell has loop labels extra care should be taken when determining what loop the flow control statements relate to.

Proposed Design

No response

No files, tests, or entry points are named. Start by locating the extension's existing keyword-highlighting and syntax/AST handling, then compare the requested if/else, try/catch/finally, return, and loop-flow cases, including labeled PowerShell loops; done means related keywords highlight at the cursor without incorrect matches.