Add Codeowners (#421)

## Motivation / Implements

Apollo is updating our standards to require a CODEOWNERS file for every
repo in our organizations. This PR adds a CODEOWNERS file to this repo.
Please customize the proposed CODEOWNERS file as needed prior to
merging.

The SecOps team plans to merge this PR during the week of 2023-11-20 if
it is not merged prior to that week.

---------

Co-authored-by: Dariusz Kuc <9501705+dariuszkuc@users.noreply.github.com>
Co-authored-by: Renée <renee@kooi.me>
Co-authored-by: Renée Kooi <renee.kooi@apollographql.com>

CODEOWNERS

@@ -0,0 +1,4 @@
+# This file was automatically generated by the Apollo SecOps team
+# Please customize this file as needed prior to merging.
+
+* @apollographql/atlas @apollographql/polaris