Solution: add automatic charge balancing and other misc improvements

[rkingsbury]

[1.1.0] - 2024-07-27

Fixed

• equilibrate: Fixed a bug that could cause an AttributeError when pH was used for charge
  balancing.
• Database: size.radius_ionic was missing units for Ni[+2] and Cr[+3]. Correct units have been added.

Added

• Solution: New automatic charge balancing method will automatically identify the majority (highest concentration)
  cation or anion as appropriate (depending on the charge balance) for charge balancing. To use this mode, set
  balance_charge='auto' when instantiating a Solution.

Changed

• Solution.add_amount: This method will now add solutes that are absent from the Solution. Previously, calling, e.g.,
  add_amount('Na+', '1 mol') on a Solution that did not contain any sodium would result in an error. A warning
  is logged if the method has to add a new solute.
• pre-commit autoupdate
• Misc. linting and code quality improvements.
• Unit tests: update tmpdir to tmp_path text fixture.
• CI: Small updates to pre-commit and GitHub actions per scientific python repo review.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.24%. Comparing base (f7d39e9) to head (2afe6ef).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/pyEQL/solution.py	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #151      +/-   ##
==========================================
+ Coverage   81.84%   82.24%   +0.39%     
==========================================
  Files           9        9              
  Lines        1482     1470      -12     
  Branches      321      321              
==========================================
- Hits         1213     1209       -4     
+ Misses        226      220       -6     
+ Partials       43       41       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.