Func-adl-uproot

- allow cross joins
- fix chained comparisons
- implement `First`, `ElementAt`, and `Last` operators

- updated Uproot requirement to avoid errors when reading trees with empty branches

- added `UprootDataset` to allow running locally
- implemented `Choose`
- fixed URL parsing
- implemented `ToFourMomenta`
- implemented `OrderBy`
- fixed bug when passing in a Python AST (`ast.AST`) with custom `qastle` LINQ nodes