New Type System/NumPy 2 support tracking

[kc611]

This issue page tracks the progress of NumPy 2 development and consequently the development of a new type system alongside it for making it possible. Following are a list of tasks to be accomplished:

• Adding a new type system implementation capable of distinguishing between NumPu and Python scalars to be able to apply casting rules defined by NumPy 2.
  • Adding new types for scalars and isolating old types from the implementations. (Type system implementation #1: Added initial implementation for a new type system.  #9408)
  • Isolating and aliasing the type initialiations across Numba.
  • Adding templates for new type system
• Abstracting out the typecasting rules to be able to manage multiple sets of independent type casting rules. (Determined by config flags)
  • Adding NumPy 2 casting rules as one of the possible set of casting rules.