Feature: Create "unwrapped" overload for hasX if X is a value type #159

This is potentially a little vague in its broadness, but here goes.

Say we have a value class like e.g.

@Value
class AccountNumber {
    String rawValue;
}

If another class (for which we generate assertions) has a property of this type, we can assert:

assertThat(someObject).hasAccountNumber(new AccountNumber("abc"))

Nicer would be:

assertThat(someObject).hasAccountNumber("abc")

The generator could look for constructors, static _.of methods, and other popular patterns. It's not clear to me if there should be a limit on the length of the parameter list. Anyway, the desired implementation seems straight-forward:

public S hasAccountNumber(String accountNumberRawValue) {
   return hasAccountNumber(new AccountNumber(fooRawValue));
}

As an alternative, there could be an annotation like e.g.

@AssertionAlias
static Foo of(String rawValue) { ... }

On a property Foo bar, this would cause additional generation of something like

public S hasBar(String fooRawValue) {
   return hasBar(Foo.of(fooRawValue));
}

PS: This is probably easily done for specific use cases in any given project using templates, but I don't see documentation for a way to inject custom templates when using the generator through the Maven plugin.