Support for PEP 695 (Type parameters / generics) #262

Related to #229: when writing a generic class/function that uses type parameters, the syntax is incorrectly highlighted. This syntax was introduced in 3.12 via PEP 695.

Currently these are incorrectly scoped as attribute access (see attached screenshots). MVP to reproduce is simply

class Foo[T]:
  pass

• Editor name and version: Sublime text 4169
• Platform: Windows 10
• Color scheme: Monokai
• MagicPython version: 1.1.1