chore: updated - license header, action workflow, & core files

[erisu]

Platforms affected

n/a

Motivation and Context

Make sure license headers are added and GH Action Workflows are configured correctly.

Description

• Added missing license headers
• Formatted some of the existing license headers
• Added permissions block to GH Action Workflows
• Added Release Auditing Workflow

Testing

n/a

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary