Support manual extensions to generated types #2798
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### What Introduces a simple extension system for C++ codegen: Add an extra cpp file that will be compiled as part of the SDK. A section between two markes is copied into the generated hpp as part of generation (typically this section is removed from compilation via #ifdef) Adds extensions to: * color * vec2/vec3/vec4 * quaternion * origin3d * point2d * point3d * arrow3d ... and uses them to simplify examples and test code! All fully supported archetypes now have a simple test that checks that the base interface works and that we can serialize out to arrow without issues. Additionally, there's tests for vecN/quaternion/color to check that their various constructors work as expected (not being a C++ expert it's fairly hard to predict) Extends codegen with single-array-field-constructors. --------- * part of #2647 * Fixes #2798 * Fixes #2785 * Missing only 2D example: #2789 * Adds to #2791 ### Checklist * [x] I have read and agree to [Contributor Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and the [Code of Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md) * [x] I've included a screenshot or gif (if applicable) * [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/2916) (if applicable) - [PR Build Summary](https://build.rerun.io/pr/2916) - [Docs preview](https://rerun.io/preview/pr%3Aandreas%2Fcpp%2Fcustom-extensions/docs) - [Examples preview](https://rerun.io/preview/pr%3Aandreas%2Fcpp%2Fcustom-extensions/examples)
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