Func<T> should use Factory<T> if available

[michal-ciechan]

    [Test]
    public void Create_ReturnsNewInstanceEachTime()
    {
        var a = _moq.Create<ClassWithFuncInCtor>();
        var b = _moq.Create<ClassWithFuncInCtor>();
        
        a.Should().NotBeSameAs(b);
    }

    [Test]
    public void Create_FuncParameter_ReturnsSameInstanceEachTime()
    {
        var subject = _moq.Create<ClassWithFuncInCtor>();

        var a = subject.FuncOfIDependencyA();
        var b = subject.FuncOfIDependencyA();

        a.Should().BeSameAs(b);
    }

    [Test]
    public void Factory_For_Constructor_Func()
    {
        _moq.Factory<IDepencyA>(ctx => _moq.Create<IDepencyA>());

        var subject = _moq.Create<ClassWithFuncInCtor>();

        var a = subject.FuncOfIDependencyA();
        var b = subject.FuncOfIDependencyA();

        a.Should().NotBeSameAs(b, "we registered a factory for IDependencyA");
    }

    [Test]
    public void Factory_Extensions()
    {
        // Same as _moq.Factory<T>(ctx => _moq.Create<T>())
        _moq.Factory<IDepencyA>();

        var subject = _moq.Create<ClassWithFuncInCtor>();

        var a = subject.FuncOfIDependencyA();
        var b = subject.FuncOfIDependencyA();

        a.Should().NotBeSameAs(b, "we registered a factory for IDependencyA");
    }