[macro] [Haxe 5] Make it possible to get the untyped version (haxe.macro.Field) of super classes and for Context.getType

Currently you can only get the typed version (haxe.macro.ClassField) which has some context info missing, especially around

?arg = val
arg = val
?arg:Null
?arg:Type
?arg:Null = val
arg:Null = val
arg:Type = val

especially when making a wrapper around a class that keeps the args the same.
And theres also a possibility of halting compilation due to the macro trying to type stuff in a incorrect order.

Start by examining the macro APIs for haxe.macro.Field, haxe.macro.ClassField, and Context.getType, focusing on how superclass fields and type information are exposed. Define how the untyped representation should preserve argument annotations and defaults, then verify that wrappers can retain those details without causing incorrect typing order.

Written by the indexing model from the issue text.