Add predicate for patching

[kyle69]

Proposed new patching functionality for a personal need that could be useful to other MartenDb users.

• Possibility of deleting one or more elements according to a predicate.
• Possibility of adding an element according to a predicate.
• Possibility of inserting an element according to a predicate.

[mysticmind]

@kyle69 Happy to see this PR and your proposed features to the patching API. I had a brief look and it looks fine, will review it thoroughly as a next step. I also think the CI build failures are not due to your changes.

Edit: I haven't seen much questions or traction on the native patching feature since the time I added this to Marten. Either it is pretty good that everything works well or it is not discovered or used much by end users :-)

[kyle69]

@mysticmind Glad you like the feature :) I don't really understand why the build is in error.
Thanks a lot!

[jeremydmiller]

@kyle69 @mysticmind I'll push through this tomorrow morning and deal w/ whatever the CI turned up. Good PR to have in for the next release.

[mysticmind]

@kyle69 @mysticmind I'll push through this tomorrow morning and deal w/ whatever the CI turned up. Good PR to have in for the next release.

This PR looks fine. Go ahead.