Implicitly constructed arguments

```cs
var thing1 = new MyType ("foo", new ArgThing("bar"));
```
can be refactored to with RCS1250
```cs
MyType thing1 = new("foo", new ArgThing("bar"));
```

But I want to take mine further to:
```cs
MyType thing1 = new("foo", new("bar"));
MyType thing2 = FactoryMethod("foo", new("bar"));
```

Can these be added to roslynator for arguments?

The issue names no files or tests; start by examining the existing RCS1250 implementation and how it handles constructor arguments. Determine the scope for implicit argument construction in the assignment and factory-call examples, then add coverage showing both forms are recognized correctly.

Written by the indexing model from the issue text.