Dataflow: Introduce support for src/sink grouping in path results. #11183
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This introduces a new feature in the shared data flow library. The primary use-case is currently intended to be debugging, but the feature may also find other uses.
Sometimes we get a huge number of path results in a query, which can be cumbersome to look through. If, in these case, we mostly care about flow reaching some sink (possibly with some property) rather than needing to know about the specific sink, and we just want to see representative paths reaching arbitrary sinks, then it can be beneficial to reduce the number of source-sink pairs by adding one or more synthesised sink nodes that collect the flow from multiple sinks. E.g. for MaD sink model generation we care only about the sink kind that's reached rather than the specific sink node.
This PR introduces support for grouping several sink nodes into a single sink-group-node (represented by a string) in order to reduce the number of path results. The symmetric support for source grouping is also added.