Support for wildcard/ignore-case

## What is your idea?
It would be awesome to have a case-insensitive wildcard. Curious of the communities thoughts. On the surface, it doesn't seem like a tough implementation, though I'm not terribly confident in the syntax given that we were trying to avoid an `ignore-case` keyword...

```
{
"detail": {
"command_path": [ {"wildcard": {"ignore-case": "*/Cmd.exe*"} } ]
}
}
```

The above matches `stufff/cmd.exe -x` `stuff/Cmd.exe -x` `StUff/CmD.ExE `.

## Would you be willing to make the change?
Probably

## Additional context

Add any other context (such as images, docs, posts) about the idea here.

Begin by locating the rule syntax and wildcard-matching entry points in the event-ruler codebase; the issue names no files or tests. Resolve the JSON syntax and case-insensitive matching semantics with maintainers, then add coverage showing the proposed pattern matches the listed command-path variants.

Written by the indexing model from the issue text.