OWNERS: add OWNERS_ALIASES, add approvers/reviewers who already held roles (operator-framework#3955)

Author: Eric Stroczynski

OWNERS

@@ -1,25 +1,7 @@
 approvers:
-  - hasbro17
-  - estroz
-  - shawn-hurley
-  - joelanford
-  - theishshah
-  - camilamacedo86
-  - jmccormick2001
-  - jmrodri
-  - fabianvf
-  - varshaprasad96
-  - rashmigottipati
+- sdk-admins
+- sdk-approvers
 reviewers:
-  - hasbro17
-  - estroz
-  - shawn-hurley
-  - joelanford
-  - theishshah
-  - camilamacedo86
-  - jmccormick2001
-  - jmrodri
-  - fabianvf
-  - varshaprasad96
-  - rashmigottipati
-  - jberkhahn
+- sdk-admins
+- sdk-approvers
+- sdk-reviewers

OWNERS_ALIASES

@@ -0,0 +1,31 @@
+
+# See the OWNERS docs: https://git.k8s.io/community/contributors/guide/owners.md
+
+aliases:
+  # Contributors who can be contacted to perform admin-related tasks on the repo.
+  # This role is a subset of the approver role.
+  sdk-admins:
+  - estroz
+  - joelanford
+  - jmccormick2001
+  - jmrodri
+  - asmacdo
+
+  # Contributors who can approve any PRs in the repo.
+  sdk-approvers:
+  - theishshah
+  - camilamacedo86
+  - fabianvf
+  - varshaprasad96
+  - rashmigottipati
+  - bharathi-tenneti
+
+  # Contributors who can review and LGTM any PRs in the repo.
+  sdk-reviewers:
+  - jberkhahn
+
+  # Contributors who were approvers that are no longer directly involved with the project.
+  # This role is symbolic.
+  sdk-emeritus-approvers:
+  - shawn-hurley
+  - hasbro17