[FEAT]: Export EventHandler type

[gbidkar-capsule]

Describe the need

When using the @octokit/webhooks library, I'm managing the webhooks HTTP receiving through an external HTTP library for granular control.

With that being said, I'm still using the built-in EventHandler by invoking createEventHandler.
But, I want it in a typed property, which isn't exposed directly from the index.ts - and instead has to be imported this way:

import { EventHandler } from 'node_modules/@octokit/webhooks/dist-types/event-handler';

And later used as:

private readonly eventHandler: EventHandler<EmitterWebhookEvent>;

SDK Version

Latest

API Version

Latest

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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[wolfy1339]

I have questions:
Why isn't the included middleware good enough?

If the included middleware isn't good enough, why don't you write your own?

Why are you using internal imports?

The createEventHandler() function is typed already.

private readonly eventHandler: EventHandler<EmitterWebhookEvent>;

That is actually wrong. The type parameter isn't needed if you aren't adding properties to the event.
It's supposed to be used as the type of an object of which you are extending the default webhooks event with.

[wolfy1339]

The types will get fixes in #1101