Add Camera plugin

[tomas7770]

Description

Add a new cameraPlugin, which adds the PerspectiveCamera component (same fields as old Camera, plus a new active field to support multiple cameras per RenderTarget) and the DrawsTo relation, which has no fields.

Checklist

• [ ] Self-review changes.
• [ ] Evaluate impact on the documentation.
• [ ] Ensure test coverage.
• [ ] Write new samples.
• [x] Add entry to the changelog's unreleased section.

[github-actions[bot]]

PR Preview Action v1.4.7 :---: :rocket: Deployed preview to https://GameDevTecnico.github.io/cubos/docs-preview/pr-1125/ on branch gh-pages at 2024-04-18 15:52 UTC

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 39.01%. Comparing base (5b09369) to head (0dbd823).

Files	Patch %	Lines
engine/src/render/camera/perspective_camera.cpp	0.00%	7 Missing :warning:
engine/src/render/camera/plugin.cpp	0.00%	3 Missing :warning:
engine/src/render/camera/draws_to.cpp	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1125 +/- ## ========================================== - Coverage 39.04% 39.01% -0.03% ========================================== Files 334 337 +3 Lines 26162 26174 +12 ========================================== - Hits 10214 10213 -1 - Misses 15948 15961 +13 ```

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