Rewrite-Maven update plugin configuration recipe

[pway99]

Add recipe for updating maven plugin configuration.
required for rewrite-quarkus

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Gershman edits:
I'm thinking this can be broken into a fundamental discrete which relies on xpath matcher to include children selection criteria. As in, being able to specify an xpath matcher with predicates such as

/project/build/plugins/plugin[artifactId="rewrite-maven-plugin"]/configuration/activeRecipes

This would give us multiple benefits:

• 1.) we'd be able to offer this path selection for adding and removing arbitrary configuration keys, and
• 2.) we'd ostensibly be able to reuse this for rewrite-yaml, and thus rewrite-kubernetes to be able to do element selection criteria. It's basically impossible to select elements from lists without this.

That might make the most sense

[aegershman]

an example of updating plugin configuration can be seen here: (openrewrite/rewrite-quarkus#26)
But it's not some special function to being in a plugin block. It's just normal xml tag traversal.

Closing this in general, but opened an issue on observations about declarative path matching in #593