Microbenchmarking For TF

[NihalHarish]

Description of changes:

• Runs the get_hook function 1 million times
• The test asserts that the runtime remains constant across multiple runs.

Style and formatting:

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

Issue number, if available

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #515 (b7d89a4) into master (73dfb46) will decrease coverage by 0.99%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
- Coverage   74.86%   73.86%   -1.00%     
==========================================
  Files         127      117      -10     
  Lines       11110    10584     -526     
==========================================
- Hits         8317     7818     -499     
+ Misses       2793     2766      -27     

Impacted Files	Coverage Δ
smdebug/xgboost/utils.py	0.00% <0.00%> (-14.76%)	:arrow_down:
smdebug/core/access_layer/s3.py	91.54% <0.00%> (-4.23%)	:arrow_down:
smdebug/core/reader.py	85.18% <0.00%> (-3.71%)	:arrow_down:
smdebug/exceptions.py	64.28% <0.00%> (-2.39%)	:arrow_down:
smdebug/core/access_layer/file.py	96.00% <0.00%> (-2.00%)	:arrow_down:
smdebug/core/tfrecord/tensor_reader.py	95.45% <0.00%> (-1.52%)	:arrow_down:
smdebug/core/locations.py	86.11% <0.00%> (-1.39%)	:arrow_down:
smdebug/core/tensor.py	79.03% <0.00%> (-1.21%)	:arrow_down:
smdebug/xgboost/hook.py	0.00% <0.00%> (-1.06%)	:arrow_down:
smdebug/core/utils.py	80.17% <0.00%> (-0.88%)	:arrow_down:
... and 13 more

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