Add spherical harmonics EOT tracker

[FlorianPfaff]

Summary

• Add a PyRecEst-native SphericalHarmonicsEOTTracker for 3-D star-convex extended-object tracking.
• Represent the state as center plus raw, unnormalized spherical-harmonic radial extent coefficients, matching the MATLAB tracker convention.
• Add coefficient packing, real/complex conversion, rotation, raw radius evaluation, MATLAB-equivalent point projection measurement updates, and public exports.
• Cover the tracker with focused tests for coefficient conversion, raw radius evaluation, measurement projection, updates, row-wise measurements, and zero-rotation prediction.

Validation

• python -m ruff check src\pyrecest\filters\spherical_harmonics_eot_tracker.py tests\filters\test_spherical_harmonics_eot_tracker.py src\pyrecest\filters\__init__.py
• python -m ruff format --check src\pyrecest\filters\spherical_harmonics_eot_tracker.py tests\filters\test_spherical_harmonics_eot_tracker.py src\pyrecest\filters\__init__.py
• pytest -q tests\filters\test_spherical_harmonics_eot_tracker.py
• pytest -q tests\filters

[github-actions]

✅MegaLinter analysis: Success

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✅ REPOSITORY	checkov	yes		no	no	23.79s
✅ REPOSITORY	gitleaks	yes		no	no	12.49s
✅ REPOSITORY	git_diff	yes		no	no	0.08s
✅ REPOSITORY	secretlint	yes		no	no	8.37s
✅ REPOSITORY	syft	yes		no	no	3.2s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.64s
✅ REPOSITORY	trufflehog	yes		no	no	20.62s
✅ YAML	prettier	5	0	0	0	0.55s
✅ YAML	v8r	5		0	0	5.22s
✅ YAML	yamllint	5		0	0	0.68s

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