create CODEOWNERS file

[spencerlepine]

Description of changes: Create CODEOWNERS file

• https://github.com/orgs/amazon-connect/teams/blitz
• https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
• https://docs.github.com/en/enterprise-cloud@latest/organizations/organizing-members-into-teams/managing-code-review-settings-for-your-team

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