qcscine/utilities: Release 3.0.0

Changes:

• Enable conan builds and PyPI releases
• Add Newton-Trajectory type optimizer
• Add statistics and machine learning tools (PCA, k-fold cross-validation, kernel ridge regression)
• Add chemical representations for machine-learned force fields
• Charge Model 5 corrections for Hirshfeld atomic partial charges
• Add various conceptual DFT quantities
• Enable access to the density matrix and GTOs in Python
• Improve Dimer transition state search algorithm
• Add implicit solvation option to ORCA and Gaussian interfaces
• Add python bindings sphinx documentation
• Separate Settings from its base ValueCollection in python bindings