wasm: refactor event dispatcher wait logic

We support blocking the event dispatcher thread in two cases:
 - secondary threads: wait on a wait condition
 - main thread: asyncify suspend

Create abstraction which implements both cases under a common API:
  bool QEventDispatcherWasm::wait(int timeout)
  void QEventDispatcherWasm::wakeUpDispatcherThread()

Make QEventDispatcherWasm::wakeUp() use the new API.

Also refactor the runOnMainThread functionality to provide several variants
  - runAsync(fn): makes an async call on the main thread, from the main thread.
  - runOnMainThread(fn): runs fn on the main thread, synchronously if
      called from the main thread.
  - runOnMainThreadAsync(fn): runs a fn on the main thread, always asynchronously

Change-Id: Ia6ac21a162e6b8ea2d71bacf6085beb9567588b5
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

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