docs: public static boolean isMapLiteralWithOnlyConstantValues(Expression expression) {
          if (expression instanceof MapExpression) {
              List<MapEntryExpression> entries = ((MapExpression) expression).getMapEntryExpressions();
              for (MapEntryExpression entry : entries) {
                  if (!isConstantOrConstantLiteral(entry.getKeyExpression()) ||
                      !isConstantOrConstantLiteral(entry.getValueExpression())) {
                      return false;
                  }
              }
              return true;
          }
          return false;
      }