Add utility method to format dictionary

[DhruvDuseja]

Summary

Major changes:

• Add in the utility method format_solute to format a solute dictionary with the provided unit. (Closes add utility function to format dict with single unit #53)

Todos

If this is work in progress, what else needs to be done?

• Need help with the documentation

Checklist

• Google format doc strings added.
• Code linted with ruff. (For guidance in fixing rule violates, see rule list)
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• I have run the tests locally and they passed.

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
src/pyEQL/utils.py	100.00% <100.00%> (ø)

📢 Thoughts on this report? Let us know!.

[rkingsbury]

Thank you @DhruvDuseja ! It looks like tests are passing so this is close to ready. I have two minor changes to request (see comments), and then feel free to remove WIP status and I think it'll be good to merge.

[DhruvDuseja]

Thanks for the feedback @rkingsbury. I've made the changes in the doc and added the test. Please let me know if this looks good. Hopefully, the doc reads better now but please let me know if there are any changes needed there.

[rkingsbury]

Looks great! I made some minor comments on the docstring. The last thing I request is that you please update the changelog. This will be the first change after the last release, so you can add a new section (following the Keep a Changelog format) like this:

## [Unreleased]

### Added
-

Please take out of WIP status when you're ready, and I'll be happy to merge.

[DhruvDuseja]

Thanks @rkingsbury. I've made the required changes, hope this looks good!

[rkingsbury]

Closes #65

Thanks @DhruvDuseja !