Refactor CondensedPhaseArrhenius in musica.mechanism_configuration to use composition instead of inheritance from _CondensedPhaseArrhenius.

Acceptance Criteria

• The class no longer inherits from _CondensedPhaseArrhenius.
• The internal C++ instance is held in self._instance.
• All properties (e.g., A, B, C, etc.) delegate to or update the internal C++ object.
• Reactants and products use Python Species and Phase objects.
• serialize() works as an instance method and operates entirely on Python-visible data.
• Public interface reflects only Python-native types.

Ideas

• Use the wrapper pattern from tuvx.py as a guide.
• Consider creating helper functions for conversion between Species/Phase and _ReactionComponent.
• Use @property decorators for clean delegation.

Tasks

• Replace class CondensedPhaseArrhenius(_CondensedPhaseArrhenius) with class CondensedPhaseArrhenius.
• Construct the C++ _CondensedPhaseArrhenius instance inside __init__ and assign to self._instance.
• Forward all attributes and logic to self._instance using property methods where needed.
• Ensure reactants, products, aerosol_phase, and aerosol_phase_water use Python Species and Phase objects.
• Update the serialize() method to access only Python-visible data.
• Remove the @staticmethod pattern from serialize; support instance method serialization.