excaliburjs / Excalibur / 29337541112

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feat: Implement Plugin System (#3670)

# New 1st Party Plugin System

This allows deep configuration of the excalibur subsystems by providing lifecycle hooks/interception points at every critical juncture to boot the engine. Right now we are mainly focused on renderer/asset type plugins so this initial stab leans in that direction.

 1. **Engine construction** — `onEnginePreConfig` → (flags frozen) → `onEnginePostConfig`
 2. **Engine start** — `onLoad` → (resources loaded) → `onLoadComplete`
 3. **Engine initialize** — `onEnginePreInitialize` → `onEnginePostInitialize`
 4. **Graphics context construction** — `onGraphicsPreConfig` → `onGraphicsPostConfig`
 5. **Graphics context init** — `onGraphicsPreInitialize` → `onGraphicsPostInitialize`
 6. **Scene initialize** — `onScenePreInitialize` → `onScenePostInitialize`
 7. **Scene activate** — `onScenePreActivate` → `onScenePostActivate`
 8. **Scene deactivate** — `onScenePreDeactivate` → `onScenePostDeactivate`
 9. **Graphics context lost/restored** — `onGraphicsContextLost` → `onGraphicsContextRestored`
 10. **Engine dispose** — `dispose`

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