Replaced PhreeqcRM interface ctypes with phreeqcrm pip package

[matteomasi]

• The core module mibiremo/phreeqc.py has been rewritten to wrap the phreeqcrm pip package instead of using ctypes. PhreeqcRM no longer depends on compiled libraries (previously bundled with the mibiremo package itself), and instead always stays up to date with the phreeqcrm pip package.
• Added phreeqcrm dependency in pyproject.toml
• Updated tests and examples

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[raar1]

Good work @matteomasi ! Sorry for the late review. This is a big improvement as maintaining the wrapper for the phreeqc binaries was always going to be a bit of a maintenance nightmare, so it's good to see a separate pypi package for it.

I'm not too sure about the testing, currently, as it seems to me to largely be testing a mock of phreeqc rather than functionality of mibiremo (probably because we just moved a lot of functionality to the new package). We could have a call in Aug or Sep maybe to discuss some ideas (I think @JaroCamphuijsen and I had a few regarding using mibiremo + mibitrans)