MethodCallExpr.clone() loses the parent reference

Not sure it's a bug but when we clone MethodCallExpr JavaParser loses the parent reference.

String sample = " { System.out.println(\"\"); }";
Statement stmt = parseStatement(sample);
Optional expr = stmt.findFirst(MethodCallExpr.class);
assertTrue(expr.isPresent());
assertTrue(expr.get().getParentNode().isPresent());
assertTrue(expr.get().clone().getParentNode().isPresent()); // failed

Reproduce the issue with the provided parseStatement sample and inspect MethodCallExpr.clone() together with getParentNode(). Confirm how the cloned expression handles its parent reference, then add a regression test showing the intended behavior and run the relevant JavaParser test suite.

Written by the indexing model from the issue text.