feat(rbac): add roles and permissions

frontend/athena/lib/permissions.ts

@@ -0,0 +1,19 @@
+import type { CurrentUser, PermissionName } from "@/types/rbac";
+
+export function hasPermission(user: CurrentUser | null | undefined, permission: PermissionName) {
+  return Boolean(user?.permissions.includes(permission));
+}
+
+export function hasAnyPermission(
+  user: CurrentUser | null | undefined,
+  permissions: PermissionName[],
+) {
+  return permissions.some((permission) => hasPermission(user, permission));
+}
+
+export function hasAllPermissions(
+  user: CurrentUser | null | undefined,
+  permissions: PermissionName[],
+) {
+  return permissions.every((permission) => hasPermission(user, permission));
+}