Adds missing license headers

[skrawcz]

Adds missing license headers to sf-hamilton package

Changes

• license header

How I tested this

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[pjfanning]

lgtm

[zilto]

Reviewed all changes. Makes sense

[cswartzvi]

Looks good to me!