Add PCA as dimensionality reduction method

[stefanhahmann]

This PR introduces support for Principal Component Analysis (PCA) as a new dimensionality reduction method and updates both the feature computation and user interface accordingly. Key changes include:

• Adding new PCA feature computation implementations and tests for both spot and branch models.
• Updating the UI to include a PCA radio button and handle PCA-specific settings.
• Updating documentation and build configurations to reflect the new PCA support.
• Activate t-SNE feature computation
• Update documentation to reflect the new t-SNE support.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
90.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud