Throw error for "explicit" hydrogens that aren't in molecule graph

[jaclark5]

This PR flags with an error implicit hydrogens missed by RDKit, e.g., [NH+], as referenced in:

• Issues resolved:

  • Closes RDKit from_smiles allows implicit H smiles when explicit H is True #936
  • Closes Molecule.from_mapped_smiles allows loading of invalid mapped SMILES with RDKit backend #1696

• Resolves QCA-Dataset Submission Issue 327

• This PR might partially be related to partially address QCS-Dataset-Submission Issue 2

• This PR seeks to throw an error for unacceptable CMILES strings, why these strings are created is a topic of OpenFF-Toolkit Issue 1697, QCSubmit Issue 166 and Issue 216, and OpenFF-Sage Issue 2. Possible causes could be related to OpenFF-Toolkit Issue 900.

• The solution contributed in this PR throw appropriate errors for molecules in the QCA-Dataset Submissions which were erroneously submitted: PR 207, PR 228 as outlined in OpenFF-Toolkit Issue #1696 (resolved in this PR)

• Tag issue being addressed

• Add tests

• Update docstrings/documentation, if applicable

• Lint codebase

• Update changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.08%. Comparing base (a92402f) to head (022401a).
Report is 1 commits behind head on main.

Additional details and impacted files

[j-wags]

This is fantastic - I think you nailed this. Some minor changes requested that I think are important, but I think the core of this is really solid. Nice work.

[j-wags]

Thanks a million @jaclark5 - This is super thorough work and a great quality PR. Approved pending merging the changes proposed in this review and fixing the tests that we expect will break. Once the tests are green, you're clear to merge!