Solution: fix pH charge balancing bug and possible water ion imbalance

[rkingsbury]

[1.1.3] - 2024-07-28

Fixed

• Solution: Fix a bug in which setting balance_charge to pH could result in
  negative concentration errors when charge balancing or after equilibrate was
  called. Solution now correctly enforces the ion product of water (Kw=1e-14)
  whenever adjusting the amounts of H+ or OH- for charge balancing.

Added

• Solution._adjust_charge_balance: Added a privat helper method to consolidate charge
  balancing code used in __init__ and equilibrate.

[codecov]

Codecov Report

Attention: Patch coverage is 90.62500% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.93%. Comparing base (8bef6a4) to head (0e0ee6a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/pyEQL/solution.py	90.32%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   82.64%   82.93%   +0.29%     
==========================================
  Files           9        9              
  Lines        1469     1483      +14     
  Branches      322      320       -2     
==========================================
+ Hits         1214     1230      +16     
  Misses        216      216              
+ Partials       39       37       -2     

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