Additional decorrelation work

[scsmithr]

Detect additional correlations: https://github.com/glaredb/rayexec/blob/1466b38894916554546b8b7c4c1044e5ac9f7e4e/crates/rayexec_execution/src/logical/planner/plan_subquery.rs#L383

Currently detects correlations in nodes that likely make up the majority of correlated queries. Not detecting correlations means we end up with errors like:

Column expr not referencing a valid table ref, column: #0.1, valid tables: [#3]

More operators to push dependent joins down through: https://github.com/glaredb/rayexec/blob/1466b38894916554546b8b7c4c1044e5ac9f7e4e/crates/rayexec_execution/src/logical/planner/plan_subquery.rs#L455-L459

Missing some of the ones that we do detect correlations in. We just get a "Not yet implemented: dependent join pushdown for node: ..." error for operators that are missing.

https://btw-2015.informatik.uni-hamburg.de/res/proceedings/Hauptband/Wiss/Neumann-Unnesting_Arbitrary_Querie.pdf