FIx Issue #537 - Step 4 - Fix MapToTarget behavior From RecordType

[DocSvartz]

before from

record TestRecord()
{
    public int X { set; get; }
}
record TestRecordY() 
{
    public int X { set; get; }
    public int Y { set; get; }
}

var source = new TestRecord() { X= 200};
var dest = new TestRecordY() {X = 100, Y= 500}

var adapt = source.Adapt(dest)  // always adapt == { X=200, Y=0}

after

var adapt = source.Adapt(dest)  // adapt == { X=200, Y=500}  Correct MapTotarget

equal behavior when modified using with

var adapt = dest with {X=source.X};

[DocSvartz]

@andrerav working on Ctor ignoring I found that MapToTarget was not working for RecordType.
Looks like I missed that in my original solution (
I didn't add test to avoid creating a merge conflict. Although most likely they will be anyway, Sorry

[DocSvartz]

@andrerav It also looks like this case is also not working correctly from Record (When using Ignore())

var adapt = dest with { };

I will add a separate PR after the final decision on the possibility of calling Ctor with default value.
I still need to figure out how to combine it. )