test: added a test script and bento for easier end2end testing

[jjmachan]

Description

The test bento has different endpoints and runner to test out an extreme version of the bentoml a user might run. There is also tests under tests/integration that will perform an integration test on these.
closes:

[jjmachan]

Should this be called integration test or end2end tests?

[codecov]

Codecov Report

Merging #172 (4ad7eb5) into main (c50f955) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
+ Coverage   60.16%   60.27%   +0.10%     
==========================================
  Files          24       24              
  Lines        1112     1110       -2     
==========================================
  Hits          669      669              
+ Misses        443      441       -2     

Flag	Coverage Δ
unit-tests	60.27% <ø> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
...ntoctl/utils/operator_helpers/create_deployable.py	0.00% <0.00%> (ø)
bentoctl/cli/__init__.py	85.05% <0.00%> (+0.96%)	⬆️

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