Fix PBC checks, make pbc and box length info accessible to RandomWalkState

[chrisjonesBSU]

PR Summary:

This fixes an issue with checking for overlaps along PBCs, adds a test that should have caught it. This also makes pbc information and box lengths accessible to RandomWalkState

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.27%. Comparing base (a1cac35) to head (0abeac0).

Files with missing lines	Patch %	Lines
mbuild/path/path_utils.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1341      +/-   ##
===========================================
+ Coverage    82.24%   82.27%   +0.02%     
===========================================
  Files           63       63              
  Lines         6950     6956       +6     
===========================================
+ Hits          5716     5723       +7     
+ Misses        1234     1233       -1     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.