New code fix: Generate constructor assertions

[ronnygunawan]

[Fact]
public void TestConstructor() {
    Foo foo = new(
        A: 1,
        B: "x"
    );
}

Press Ctrl+. on foo, then select "Generate constructor assertions", following lines will be generated:

[Fact]
public void TestConstructor() {
    Foo foo = new(
        A: 1,
        B: "x"
    );
    foo.A.Should().Be(1);
    foo.B.Should().Be("x");
}