[Improvement]: Support mocking with withArguments() where some arguments are fixed and some are flexible.

[Thevakumar-Luheerathan]

Description

With the current Mocking implementation, we should give all arguments if we are trying to mock a function or object. But, It is better if we can mock while keeping a few arguments fixed and letting other arguments flexible.
main.bal

Client cl = new();
public client class Client {
    remote function alp(string a, string b, string c) returns string {
        return "alp";
    }
}

tests/test.bal

@test:Config() 
function alpTest() {
  test:prepare(clientEndpoint).when("alp").withArguments(ANY, "love", "Sri Lanka").thenReturn("hi");  // Here ANY can be matched with anything
  string mal = cl->alp("I", "love", "Sri Lanka"); // It should match with previous mock
}

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Related area

-> Compilation

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