feat: Custom Material/Shader per Actor Support

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

This PR adds custom material support which enables the custom shader per Actor. To do this there is a new ex.MaterialRenderer plugin which takes over from the default batch renderer (ex.ImageRenderer) if there is a material present then it will run the custom shader attached to the material. This works by setting ex.GraphicsComponent.material = someMaterial

const material = new ex.Material({
  name: 'test',
  fragmentSource,
  color: ex.Color.Red,
});

const actor.graphics.material = material;

Changes:

• GraphicsComponent material support for whole actor shader support
• Graphics context material support in save/restore
• New ex.MaterialRenderer plugin
• Updates to draw call to support materials

TODOs

• Tests
• API cleanup
• Perf analysis