Remove loosely-typed event listener methods

[Methuselah96]

Fixes #1143

[Methuselah96]

Waiting on DefinitelyTyped/DefinitelyTyped#70279

[s-rigaud]

In one of my projects, I ended up with a signature like this for a custom TransformControls, might be great to be added here I think:

type ChangedEvents = {
  [K in `${string}-changed`]: any
}
type EventMap = THREE.Object3DEventMap & ChangedEvents & {
  change: unknown
  objectChange: unknown
  mouseDown: { mode: string }
  mouseUp: { mode: string }
}

class CustomTransformControls extends Object3D<EventMap> {

The special changed case is here to handle this special dispatch case

https://github.com/mrdoob/three.js/blob/4f067f0f4dc9e81f7fb3484962f2e973f71fab60/examples/jsm/controls/TransformControls.js#L89