[red-knot] WIP: Break up call binding into two phases #16546
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Pushing up for visibility on my progress, not ready for review yet.
This (will eventually) break up call binding into two phases:
Matching parameters just looks at the names and kinds (positional/keyword) of each formal and actual parameters, and matches them up. Most of the current call binding errors happen during this phase.
Once we have matched up formal and actual parameters, we can infer types of each actual parameter, and make sure that each one is assignable to the corresponding formal parameter type.