feat: add sample-snap

[mikesposito]

Explanation

The example snap package included in https://github.com/MetaMask/template-snap-monorepo is being added to this monorepo as first usage demonstration, and proof that CI scripts are compatible with snaps

References

N/A

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

[mikesposito]

This is essentially reverting a change made in #9. Now that we have at least one package, the original script should work properly

[khanti42]

LGTM