Remove dashmap (cf #4408) #4521
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This removes
dashmap(see #4408).While I'm at it, I reverted some conditional-compilation changes to the types of maps used in
reactive_stores. I don't think there's an actual benefit to this on wasm32—Arc/RwLock behaves much like Rc/RefCell in the single-threaded WASM environment, and SendWrapper adds some overhead, so we're not losing anything by simplifying.