Add merge function to replace two atoms by one

[pmrv]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed834841-5846-4fba-8a44-fa64a4ab060c

📥 Commits

Reviewing files that changed from the base of the PR and between ddb1888 and 9f7b8a7.

📒 Files selected for processing (2)

• src/structuretoolkit/build/geometry.py
• tests/test_geometry.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch merge

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[jan-janssen]

Looks good to me

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.06%. Comparing base (ddb1888) to head (9f7b8a7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #481      +/-   ##
==========================================
+ Coverage   97.04%   97.06%   +0.02%     
==========================================
  Files          29       29              
  Lines        1961     1978      +17     
==========================================
+ Hits         1903     1920      +17     
  Misses         58       58              

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