Update EventEmitter import for es module compatibility

[LukasBudach]

What's Changing and Why

Changed the packages/core/src/index.js import of the EventEmitter class.

Was: import EventEmitter from "events"

Now: import * as EventEmitter from "events"

This change was required for building a project utilizing Jimp custom to build a slimmer version of the library. The project is built as a module with target esnext on Node20 and Typescript using Vite.
Without this fix, vite build will produce the following error:

error during build:
RollupError: node_modules/@jimp/core/es/index.js (29:7): "default" is not exported by "node_modules/events/events.js", imported by "node_modules/@jimp/core/es/index.js".
file: [...]/node_modules/@jimp/core/es/index.js:29:7

The events package is not an es module yet, see Issue 86 and converting it to one is not on the roadmap as far as I can tell. Therefore, this fix should be applied to Jimp directly.

What else might be affected

Compatibility may be affected when building Jimp not as an es module.

Tasks

• Add SemVer Label

[hipstersmoothie]

event emitter usage has been removed, it never really made sense for this library (unless someone convinces me)