Improve error output for unsupported scenarios in System.Text.Json.Serialization

[vcsjones]

S.T.J.Serialization is expected to have a few unsupported scenarios, however this is currently difficult for the developer to diagnose because the error output for such scenarios is usually something along these lines:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Cannot bind to the target method because its signature is not compatible with that of the delegate type.
at System.Delegate.CreateDelegate(Type type, MethodInfo method, Boolean throwOnBindFailure)

As suggested in https://github.com/dotnet/corefx/issues/37522#issuecomment-490916117, this issue is to track improvement of error messages when encountered by the new serialization APIs.

[buyaa-n]

Another case: when there is no default constructor defined for a class NRE is throwing

public class PublicParameterizedConstructorTestClass
{
    private readonly string _name;
    public PublicParameterizedConstructorTestClass(string name)
    {
        _name = name;
    }
    public string Name
    {
        get { return _name; }
    }
}

[Fact]
public void TestNoDefaultConstuctor() {
    string json = @"{""Name"":""Name!""}";
    Assert.Throws<JsonException>(() =>JsonSerializer.Parse<PublicParameterizedConstructorTestClass>(json));
}

[MarcoRossignoli]

@steveharter @ahsonkhan is this up for grabs or there is someone working on?

[ahsonkhan]

is this up for grabs or there is someone working on?

It's up for grabs. Marking accordingly.

[MarcoRossignoli]

Link another related issue https://github.com/dotnet/corefx/issues/37188

[Anipik]

@MarcoRossignoli are you working on it ?

[MarcoRossignoli]

I worked on some of these here dotnet/corefx#38061
I found other non covered cases with this https://github.com/dotnet/corefx/issues/37188#issuecomment-495267071

[steveharter]

I recommend closing this. We should have separate issues for any remaining issues.

[steveharter]

Closing. Please create new issues for any remaining issues.