chore: Create CODEOWNERS

[jamesnrokt]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-branch-check-name.yml

Summary

• Create CODEOWNERS

Testing Plan

• N/A

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes N/A

[Copilot]

Pull Request Overview

Adds a CODEOWNERS file to automatically assign review ownership.

• Introduce a .github/CODEOWNERS file
• Assigns all files (*) to the @mparticle-integrations/sdk-team