feat: Scrub/ignore by predicate function

[JulianRooze]

I'm trying to introduce Verify to our large existing code base and one area of friction is that we have thousands upon thousands of dynamic properties (auto-generated IDs) that we want to ignore or scrub, which all follow a similar pattern, they all end in ID. While it's possible to use reflection at startup to find all those properties and Scrub/Ignore them one by one, it's a bit wasteful as only a small subset of them will ever pass through a call to Verify, we have to pre-emptively ignore them ahead of time. For this, I think the ability to provide a callback function that gets called at the same point the normal "is property ignore/scrub dictionary" is a good approach. The callback can be based on either the string name of the property (or anything that's not a property like a dictionary key) or on the MemberInfo of the property if you need more information to determine if the property should be ignored or not.

I did not include benchmarks as I hope from the implementation it should be clear that there shouldn't be any performance impact from this, especially not if you don't opt-in to this feature, but let me know if you must have them.

Todo:

• Docs I guess?

This is based on the discussion here:

https://github.com/orgs/VerifyTests/discussions/1345

[JulianRooze]

@dotnet-policy-service agree