Convert to TypeScript

[mcmire]

In order to align this repo with our other repos, this commit converts the existing JavaScript to TypeScript, and adds the dependencies and configuration to support this. It also adds typedoc and updates the existing GitHub workflows to publish documentation. This means we no longer need to explicitly ship type definitions as they will be generated automatically.

Finally, there were a couple of standardization-related things that were missed in previous updates, so this adds those as well. After this commit this repo should be fully compliant with the module template.

Closes#1.

[Gudahtt]

LGTM!

[mcmire]

@Gudahtt Question: since we are importing the EventEmitter type and since that type comes from @types/node, does that package need to be a dependency of this library? Right now it's just a dev dependency, but should I promote it?

[Gudahtt]

Good question. If this were any other library, I'd say yes. But I'm not sure here because it's for a built-in API. Hmm.

[Gudahtt]

We could create a lightweight type representing just the EventEmitter methods we rely on here. That would avoid needing to use that type directly in the createEventEmitterProxy.ts module. It'd make the types less likely to break after @types/node updates too. It should be simple enough:

type EventEmitterLike = {
eventNames: () => (string | symbol)[];
// eslint-disable-next-line @typescript-eslint/ban-types
rawListeners(eventName: string | symbol): Function[];
removeAllListeners(event?: string | symbol): EventEmitterLike;
};

It'd improve this package's compatibility with browser environments as well, letting us remove that eslint ignore comment about us using a Node.js module.

[mcmire]

EventEmitterLike added in 6b61eac.

[Gudahtt]

LGTM!

[mcmire]

I need to confirm that these updates don't cause any issues with MetaMask/core#1091.

[mcmire]

@Gudahtt Okay, MetaMask/core#1091 still passes all tests with this change, so this is good for re-approval.