Improve formatting of ClassDeclaration with BaseList + Constraints

[belav]

This will probably require the Align doc type, which hasn't been ported from prettier yet.

public class ThisIsSomeLongNameAndItShouldFormatWell2<T, T2, T3> :
    AnotherLongClassName<T>,
    AnotherClassName
    where T : new(), AnotherTypeConstraint
    where T2 : new()
    where T3 : new() { }
// if we format this way instead, it visually separates the base list from the constraints 
public class ThisIsSomeLongNameAndItShouldFormatWell2<T, T2, T3>
    : AnotherLongClassName<T>,
      AnotherClassName
    where T : new(), AnotherTypeConstraint
    where T2 : new()
    where T3 : new() { }