update: adding codescan analysis

[krneta]

Issue #, if available:

Description of changes:

Testing done:

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[virajvchaudhari]

1. Why this security scan tool?
2. Is this approved by AWS open-source/security team?
3. Where does this publish results to and what types of results does it publish? Is it in the repository itself or somewhere else?

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[kshyatt-aws]

Are we good to go with this?

[krneta]

I think so. I need an approval.