chore: Top-level samples directory structure

[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot https://conventionalcommits.org/

[gcf-merge-on-green[bot]]

Your PR doesn't have any required checks. Please add required checks to your main branch and then re-add the label. Learn more about enabling these checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks.