Support C# 10 and .Net 6

[belav]

The following new syntax needs to be supported and properly formatted.

1. Records struct/class

public readonly record struct Point(double X, double Y, double Z);
public readonly record class Point(double X, double Y, double Z);

2. File-scoped namespace declaration

namespace MyNamespace;

3. Extended property patterns

{ Prop1.Prop2: pattern }
// vs having to be
{ Prop1: { Prop2: pattern } }

4. Global using directives

global using System;

The following may just work without any new formatting

1. Allow AsyncMethodBuilder attribute on methods

The following work without any new formatting

1. Struct - Parameterless constructors and field initializers
2. A left-hand operand of the with expression can be of any structure type.
3. Constant interpolated strings
4. Record types can seal ToString
5. Assignment and declaration in same deconstruction