feature: Add support for py38, py39 and py310

[maaquib]

Issue #, if available: N/A

Description of changes: Adding support for py38, py39 and py310 and removing older versions (https://devguide.python.org/versions/)

Testing done:

$ tox test/unit
...
...
_____________________________________________________________________________________________________________________ summary _____________________________________________________________________________________________________________________
  black-format: commands succeeded
  flake8: commands succeeded
  pylint: commands succeeded
  twine: commands succeeded
  py38: commands succeeded
  py39: commands succeeded
  py310: commands succeeded
  congratulations :)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: 70a17d6
• Result: FAILED
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[nikhil-sk]

Should it be perhaps be?

if six.PY2
elif six.PY2

If not, this is a bit confusing - could we add comment to explain what it means...

[maaquib]

@nskool Not really sure where this pragma comes from. I just kept the configuration the same as other py3 versions

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: b5d43a2
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[davidthomas426]

LGTM