GDForStatement doesn't parse qualified type annotations (e.g. ClassName.EnumName)

[dreed-sd]

When a for-loop variable has a qualified type annotation containing a dot (e.g. ClassName.EnumName), the parser only captures the first identifier as the VariableType and the .EnumName portion leaks into the Collection expression.

as in:

for t: MyClass.MyEnum in some_array:
    pass

Expected AST:

• Variable = t
• VariableType = GDSubTypeNode with OverType = MyClass, Type = MyEnum
• Collection = some_array

Actual AST:

• Variable = t
• VariableType = GDSingleTypeNode("MyClass")
• Collection = .MyEnum in some_array

Tested on LSP branch