add-uint-support

Add support for uint16, uint32, uint64 to PyTorch operators via AT_DISPATCH macro updates.

• Add uint16, uint32, uint64 type support to operators
• Update AT_DISPATCH macros for unsigned integer types
• Support for barebones unsigned types and user-requested uint types

• Use AT_BAREBONES_UNSIGNED_TYPES to explicitly add uint types
• Replace AT_INTEGRAL_TYPES with AT_INTEGRAL_TYPES_V2 for concise updates
• Ensure all dispatch sites have consistent type coverage
• Must use AT_DISPATCH_V2, not old AT_DISPATCH
• Verify all dispatch macros are updated consistently
• Maintain correct type group formatting and comma separation

1. 1.Check if using AT_DISPATCH_V2; convert if needed
2. 2.Analyze current type groups in dispatch macro
3. 3.Choose method 1 or 2 to add uint support
4. 4.Apply transformation to all dispatch sites
5. 5.Verify all changes follow guardrails and formatting