Add repository owners and component level owners. (aws-observability#1)

*Description of changes:*
Add repository owners: @aws-observability/aws-appsignals-team
component level owners for aws-otel-distro: zzhlogin, thpierce, srprash

Author: zzhlogin

.github/CODEOWNERS

@@ -0,0 +1,8 @@
+# Learn about CODEOWNERS file format:
+#  https://help.github.com/en/articles/about-code-owners
+
+# Default owners for the entire repo
+* @aws-observability/aws-appsignals-team
+
+# Owners for aws-otel-distro folder
+/aws-otel-distro/ @zzhlogin @thpierce @srprash @AsakerMohd