chore: Add CodeQL configuration

[ckadner]

Add CodeQL configuration file to enable code vulnerability scans.

FYI @rafvasq @njhill

[github-advanced-security]

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[rafvasq]

/lgtm

[kserve-oss-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ckadner, rafvasq

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[kserve-oss-bot]

New changes are detected. LGTM label has been removed.