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Branched from #357.
This PR starts the work of gathering all LSP inputs to a new
WorldState
struct. This data structure will eventually be a pure value without any interior mutability (e.g. no DashMap of Documents). The goal is that if you take a clone of it, you can send it off to a long-running background task without running the risk of invalidated assumptions due to input mutation after an LSP update.Progress towards posit-dev/positron#3181 (Incremental and cancellable computations with salsa): In the longer term this could serve as the source of root Salsa inputs for incremental computation. Querying an outdated Salsa input would cancel the background task with a special unwinding panic.