Defining unrecognized solids for the PHREEQC wrapper

[YitongPan1]

Description

Problem
The current wrapper only recognizes solid phases defined in PHREEQC.dat. As a result, users cannot introduce new solid phases that are not already present in the database, which limits extensibility for custom minerals.

Expected Behavior
The system should provide a mechanism to define new solid phases at runtime, without requiring direct modification of PHREEQC.dat.

Proposed Solution
Introduce an interface for defining user-specified solid phases with the following properties:

Required parameters

• chemical_name: Name of the solid
• dissolution_reaction: Stoichiometric dissolution reaction of the solid
• log_k: Equilibrium constant of the dissolution reaction

Optional parameters

• delta_h: Enthalpy change of the dissolution reaction
• V_m: Molar volume of the solid phase

[vineetbansal]

Here's the link to the properties we can add for any new unrecognized solids:
https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc/html/final-48.html#84418