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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General

• [X] I have read the CONTRIBUTING doc
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• [ ] I have updated any necessary documentation, including READMEs

Tests

• [X] I have added tests that prove my fix is effective or that my feature works (if appropriate)
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: 70a17d60887f04707d6ca80d40b9a97fd102f7fe
• Result: FAILED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-inference-toolkit-pr
• Commit ID: b5d43a2883f59ff5631410e1350d505da68d6304
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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