[VL] RAS: Incorporate query plan's logical link into metadata model

[zhztheplayer]

This is a concept work to add logical link to RAS metadata. To:

1. Make sure plans in the same group/cluster share the same logical link thus be logically identical (if query plans in the same group/cluster differ on their logical links, planner will throw an error)
2. Prove it possible to obtain Spark statistics from cost model

And with other minor improvements.

[github-actions]

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See also:

• Other pull requests

[github-actions]

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