IR Refactor Part 2: Reflection, Semantic Categories

[wingertge]

Instead of doing a very error prone conversion in the optimizer, adds new macros to automatically generate reflection info for all IR operations.
They allow decomposing the typed operation into an OpCode and a Vec<Variable> (only if all arguments are Variable, None is returned otherwise). Also allows reconstructing the typed represenation from the opcode and argument list, where applicable. Generating these conversion makes it safer and reduces the amount of code that needs to be manually added to the optimizer when adding new operations.
Also adds additional information about things like side effects and commutativity directly to operations, making it less error prone.

Additionally, introduces three new semantic categories to Operation: Arithmetic, Comparison and Bitwise. This allows breaking the monolithic Operator enum into more manageable categories.

Testing

All tests pass

[maxtremblay]

I did my best to review this one, but many changes are beyond my knowledge of cubecl. Hope this review is still useful