CONTINUE filter_replace_character: Add plugin to replace a generic character in key names

[redradrat]

This is a continuation of the changes in #1941

So, really, this is all @PettitWesley's work. Additions are basically just making the branch build - winging it and praying to holy cracking Yoda that this actually works. Just quickly verified it with a local cpu key character replacement. Worked well enough.

So I hope that opening a new PR like this is okay? I'll happily transfer my changes over to the initial branch. I'm not claiming any contributions here really.

[PettitWesley]

@redradrat So the problem with my code is that it isn't recursive, it won't work for nested maps and arrays. I was originally planning to try to get it working non-recursively first, for top level keys, and test that out, but never even made it that far. Thanks for taking this over!

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[patrick-stephens]

@PettitWesley is this still active? The stale bot is not making it this far back so just reviewing manually.

[PettitWesley]

@patrick-stephens I think my original comments still stand that this solution doesn't work since its not recursive (or can't process nested logs). I have heard many users request this though; I think someone should take this feature back up and drive it to completion.

[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.