Refine support for classmethods in record/replay

[peterallenwebb]

Description

Overridden classmethods were not recorded correctly, which these changes fix and test.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.83%. Comparing base (3956ae7) to head (7f532ab).

Files with missing lines	Patch %	Lines
dbt_common/record.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
+ Coverage   69.66%   69.83%   +0.16%     
==========================================
  Files          52       52              
  Lines        3511     3517       +6     
==========================================
+ Hits         2446     2456      +10     
+ Misses       1065     1061       -4     

Flag	Coverage Δ
unit	69.83% <86.66%> (+0.16%)	⬆️

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[ChenyuLInx]

This looks great!! Thanks!!