Rust Engine: bridge from rust #1550
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This PR adds a bridge from the AST of the Rust engine back to the AST of the OCaml engine.
It also fixes up a few nodes of the AST that were superfluous or were lacking informations.
This PR doesn't do anything with the bridge itself for now.
This PR also change slightly how names are represented: instead of using concrete identifiers for tuples, we now have dedicated nodes. This will be much easier to match on tuples of arbirary sizes.
That last change probably breaks the output of Lean @clementblaudeau, I will fix it soon.
So this PR is not ready to be merged, but can be reviewed.