Added toxenv for snyk scanning

[yunchu]

Summary

This one would be used to perform snyk code scanning from the internal development environment only because the API endpoint cannot be accessed from the external.

Once we setup the self-hosted CI instance, this one will be used by code-scanning workflow to automate snyk scanning & reporting. before that, this will be used to generate snyk report manually.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[vinnamkim]

LGTM.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (606a0c8) 78.88% compared to head (fb0d638) 78.88%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #926   +/-   ##
========================================
  Coverage    78.88%   78.88%           
========================================
  Files          215      215           
  Lines        25220    25220           
  Branches      5046     5046           
========================================
  Hits         19895    19895           
  Misses        4191     4191           
  Partials      1134     1134           

Flag	Coverage Δ
macos-11_Python-3.8	77.87% <ø> (ø)
ubuntu-20.04_Python-3.8	78.87% <ø> (ø)
windows-2019_Python-3.8	78.82% <ø> (ø)

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