Add tabulate to doc mock imports

[A-CGray]

Purpose

Expected time until merged

A.S.A.P, this fix is holding up mdolab/sphinx_mdolab_theme#17, which is in turn holding up many PRs across several repos

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Tested docs build locally before and after the fix

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.64%. Comparing base (045775d) to head (628e1b2).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #101   +/-   ##
=======================================
  Coverage   83.64%   83.64%           
=======================================
  Files           4        4           
  Lines         538      538           
=======================================
  Hits          450      450           
  Misses         88       88           

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[A-CGray]

The docs build will continue to fail until we merge mdolab/sphinx_mdolab_theme#17, which depends on this PR

[sseraj]

I can't merge this, but it looks good

[eirikurj]

I can merge this