[DXP-1227] Add CODEOWNERS file

[hamster-bay]

📋 Type of the Changes

• Breaking change
• Non-breaking change
• Bug fix / minor change

🛠 Changes being made

• Add CODEOWNERS file
• Update PR template file

✅ Checklist

• My code follows the code standards of this project
• Changed code is covered with unit tests
• I have updated READMEs and java docs (if applicable)

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 600acb5 ✅ (latest)
• b758231 ✅
• 58fdd9f ✅