Issues with classes starting with $

Related issues
- https://github.com/redhat-developer/vscode-java/issues/2219
- https://github.com/redhat-developer/vscode-java/issues/1639#issuecomment-1416703877

Steps to reproduce:
- create the $EnumUtils.java class
```
package org.sample;
public class $EnumUtils {
public void test() {
}
}
```
- create the Main.java class
```
package org.sample.main;
public class Main {
public static void main(String[] args) {
$EnumUtils foo = new $EnumUtils();
}
}
```
- try CA, Organize Import, Search, Open Type

Start by reproducing the issue with the `$EnumUtils.java` and `Main.java` examples in the issue. Check CA, Organize Import, Search, and Open Type, then trace the affected JDT entry points; done means classes whose names start with `$` work correctly in all four operations.

Written by the indexing model from the issue text.