This PR resolves a circular dependency issue in Excalibur.js when using TypeScript source files directly. It refactors `ParticleEmitter` by isolating it into a separate file and adjusting the dependency management in `Particles.ts`.

This PR has the advantage that you should not encounter this problem if Webpack should ever be replaced.

Closes  #3055

## Changes
* Isolated `ParticleEmitter`: Moved `ParticleEmitter` to its own file to manage dependencies more effectively.
* Updated `Particles.ts`: Replaced direct dependency with a type import of `ParticleEmitter`.
* Instance Check Adjustment: Replaced the `instanceof` check with a `constructor` presence check.