Remove tracetab.py

[markvrma]

Depending on what your PR does, here are a few things you might want to address in the description:

• what are the (breaking) changes that this PR makes?
  Could not find any instance of functions in tracetab.py used other than test_tracetab.py, hence they are deleted now.
  solves Remove backends/tracetab.py #5473
• important background, or details about the implementation
• are the changes—especially new features—covered by tests and docstrings?
• linting/style checks have been run
• consider adding/updating relevant example notebooks
• right before it's ready to merge, mention the PR in the RELEASE-NOTES.md

[twiecki]

Thanks for taking this on!

pymc/__init__.py:55: in <module>
[11](https://github.com/pymc-devs/pymc/runs/5218313484?check_suite_focus=true#step:8:11)
    from pymc.backends.tracetab import *
[12](https://github.com/pymc-devs/pymc/runs/5218313484?check_suite_focus=true#step:8:12)
E   ModuleNotFoundError: No module named 'pymc.backends.tracetab'
[13](https://github.com/pymc-devs/pymc/runs/5218313484?check_suite_focus=true#step:8:13)
Error: Process completed with exit code 4.

Maybe look for tracetab in the codebase.

[markvrma]

I think required changes have been made

[codecov]

Codecov Report

Merging #5479 (924fcb5) into main (3d958ad) will increase coverage by 1.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5479      +/-   ##
==========================================
+ Coverage   80.23%   81.45%   +1.22%     
==========================================
  Files          82       81       -1     
  Lines       13941    14203     +262     
==========================================
+ Hits        11185    11569     +384     
+ Misses       2756     2634     -122     

Impacted Files	Coverage Δ
pymc/__init__.py	100.00% <ø> (ø)
pymc/bart/bart.py	94.33% <0.00%> (-1.58%)	⬇️
pymc/distributions/simulator.py	86.11% <0.00%> (-0.66%)	⬇️
pymc/util.py	75.62% <0.00%> (-0.48%)	⬇️
pymc/bart/pgbart.py	95.23% <0.00%> (-0.37%)	⬇️
pymc/bart/tree.py	100.00% <0.00%> (ø)
pymc/initial_point.py	100.00% <0.00%> (ø)
pymc/distributions/bound.py	100.00% <0.00%> (ø)
pymc/smc/smc.py	97.90% <0.00%> (+<0.01%)	⬆️
pymc/step_methods/mlda.py	96.39% <0.00%> (+<0.01%)	⬆️
... and 31 more

[twiecki]

Thanks @markvrma!