CODEOWNERS: give the Stats team the Stats plugin and packages

The standalone Stats plugin and the stats and stats-admin packages had no owner, so PRs touching them requested no team review. The Stats team already owns the Premium Analytics plugin and package.

Author: Nikschavan

.github/CODEOWNERS

@@ -59,6 +59,8 @@
 
 # Packages
 /projects/packages/premium-analytics @Automattic/jetpack-stats 
+/projects/packages/stats @Automattic/jetpack-stats
+/projects/packages/stats-admin @Automattic/jetpack-stats
 /projects/packages/search/src/wpes @Automattic/prometheus
 /projects/packages/connection/src @Automattic/jetpack-connection
 /projects/packages/connection/legacy @Automattic/jetpack-connection
@@ -71,6 +73,7 @@
 # Plugins
 
 /projects/plugins/premium-analytics @Automattic/jetpack-stats 
+/projects/plugins/stats @Automattic/jetpack-stats
 /projects/plugins/boost @Automattic/jetpack-boost
 
 # Functionality that is important to our partners