perf: Refactor Transform & AffineMatrix + related perf improvements

[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)

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The PR refactors the Transform and AffineMatrix for performance & code simplicity reasons.

• The AffineMatrix is a 2D matrix and performs less calculations then its counterpart
• The Transform is move into a separate type and only calculates matrix/inverse when absolutely required reducing the cost of integration significatly

This PR also adds a few performance enhancements as well

• Removes vector allocations in the integration loop
• Inlines the ex.BoundingBox.transform to avoid vector allocations
• Pre-allocate object pool space for draw calls