core[patch]: Allow any module to emit a custom event

[jacoblee93]

Using:

await runManager?.handleCustomEvent("some_test_event", {
  someval: true,
});

Some concerns about misuse but I think generally useful as an escape hatch.

CC @afirstenberg

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[eyurtsev]

I'm not convinced that this makes sense given that it creates a 2nd way to do the same thing, but in a way that works in fewer cases. The current dispatch API is able to figure out what is the correct parent id context without requiring a run manager to be passed explicitly.