Miscellaneous updates before public release (#87)

This pull request introduces several updates focused on project
ownership, licensing, and contribution guidelines. The main changes
clarify code ownership, update the project's copyright, and reorganize
the contributing documentation for better clarity.

**Project Ownership and Licensing:**

* Added a new `CODEOWNERS` file specifying maintainers and requiring
auditor approval for changes in the `supply-chain` folder, which relates
to cargo vet.
* Updated the copyright in the `LICENSE` file from "OEMWCSE" to "Open
Device Partnership".

**Documentation and Contribution Guidelines:**

* Reorganized the `CONTRIBUTING.md` file by restructuring headings,
clarifying commit message and PR etiquette sections, and removing
redundant or outdated guidelines for branch naming, use of `unsafe`, and
commit history.

**Minor Cleanups:**

* Removed an unnecessary trailing blank line from the end of the
`LICENSE` file.

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