feat: Implied 'member' roles for site and organization (#1917)

* feat: Member roles are implied and never exlpicitly added
* Rename "GetAllUserRoles" to "GetAuthorizationRoles"
* feat: Add migration to remove implied roles
* rename user auth role middleware

coderd/database/migrations/000016_drop_member_roles.down.sql

@@ -0,0 +1,11 @@
+--- Remove the now implied 'member' role.
+UPDATE
+	users
+SET
+	rbac_roles = array_append(rbac_roles, 'member');
+
+--- Remove the now implied 'organization-member' role.
+UPDATE
+	organization_members
+SET
+	roles = array_append(roles, 'organization-member:'||organization_id::text);

coderd/database/migrations/000016_drop_member_roles.up.sql

@@ -0,0 +1,11 @@
+--- Remove the now implied 'member' role.
+UPDATE
+	users
+SET
+	rbac_roles = array_remove(rbac_roles, 'member');
+
+--- Remove the now implied 'organization-member' role.
+UPDATE
+	organization_members
+SET
+	roles = array_remove(roles, 'organization-member:'||organization_id::text);