[Do-Not-Merge] Remove debugger checkpointing

[NihalHarish]

Description of changes:

• Remove debugger checkpointing capability to build a test binary.

Style and formatting:

I have run pre-commit install to ensure that auto-formatting happens with every commit.

Issue number, if available

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[codecov-io]

Codecov Report

Merging #467 (b62fdd3) into master (b45b20f) will decrease coverage by 0.59%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #467      +/-   ##
==========================================
- Coverage   65.55%   64.95%   -0.60%     
==========================================
  Files         173      163      -10     
  Lines       13275    12928     -347     
==========================================
- Hits         8702     8397     -305     
+ Misses       4573     4531      -42     

Impacted Files	Coverage Δ
smdebug/core/hook.py	89.94% <ø> (-3.43%)	⬇️
smdebug/_version.py	100.00% <100.00%> (ø)
smdebug/core/modes.py	55.00% <0.00%> (-20.00%)	⬇️
smdebug/xgboost/singleton_utils.py	0.00% <0.00%> (-20.00%)	⬇️
smdebug/trials/profiler_trial.py	24.61% <0.00%> (-18.47%)	⬇️
smdebug/mxnet/collection.py	73.33% <0.00%> (-16.67%)	⬇️
smdebug/exceptions.py	65.47% <0.00%> (-15.48%)	⬇️
smdebug/core/reader.py	85.18% <0.00%> (-7.41%)	⬇️
smdebug/tensorflow/callable_cache.py	78.26% <0.00%> (-6.53%)	⬇️
smdebug/core/locations.py	86.11% <0.00%> (-5.56%)	⬇️
... and 14 more

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