feat: adds deleteAllRolesForUser functions (#46)

Author: jscyo

src/main/java/io/supertokens/storage/postgresql/Start.java

@@ -1534,8 +1534,11 @@ public boolean doesRoleExist(String role) throws StorageQueryException {
 
     @Override
     public int deleteAllRolesForUser(String userId) throws StorageQueryException {
-        // TODO
-        return 0;
+        try {
+            return UserRolesQueries.deleteAllRolesForUser(this, userId);
+        } catch (SQLException e) {
+            throw new StorageQueryException(e);
+        }
     }
 
     @Override

src/main/java/io/supertokens/storage/postgresql/queries/UserRolesQueries.java

@@ -226,4 +226,9 @@ public static String[] getRolesThatHavePermission(Start start, String permission
         });
     }
 
+    public static int deleteAllRolesForUser(Start start, String userId) throws SQLException, StorageQueryException {
+        String QUERY = "DELETE FROM " + getConfig(start).getUserRolesTable() + " WHERE user_id = ?";
+        return update(start, QUERY, pst -> pst.setString(1, userId));
+    }
+
 }