Feature: Class with member predicate support

[shivasurya]

Is your feature request related to a problem? Please describe.
Similar to CodeQL syntax, Class with member predicate should be available and able to query the graph

import java

class MyPublicStringMethod extends Method {
  MyPublicStringMethod() {
    this.isPublic() and
    isStringReturnType()
  }

  predicate isStringReturnType() {
    exists(RefType returnType |
      returnType = this.getReturnType() and
      returnType.getUnqualifiedName() = "String"
    )
  }
}

Describe the solution you'd like
Currently code-pathfinder supports non-member predicates outside class to filter out the tuples/records. Implement the same for class based member predicates

Describe alternatives you've considered
N/A

Use case
This will boost the inheritance for class nodes and effective filtering + reduce cardinality problem

Additional context
N/A

[shivasurya]

#187