chore: deprecate methods in GeneratorSite class

[stevenhua0320]

@sbillinge ready to review

[sbillinge]

This looks good. Are there new unittest tests or those are just cut and pasted from before. I am asking to make sure all new tests are pytest and not unittest

[stevenhua0320]

There is no new test written here and all of them are pasted from before. I will follow the precedure that writing a new test if the method does not have a test before.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.08%. Comparing base (0d60a73) to head (a2e253a).
⚠️ Report is 3 commits behind head on v3.4.0.

Additional details and impacted files

@@            Coverage Diff             @@
##           v3.4.0     #169      +/-   ##
==========================================
+ Coverage   99.03%   99.08%   +0.04%     
==========================================
  Files          13       13              
  Lines        2076     2183     +107     
==========================================
+ Hits         2056     2163     +107     
  Misses         20       20              

Files with missing lines	Coverage Δ
tests/test_symmetryutilities.py	99.80% <100.00%> (+0.05%)	⬆️

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