Support new AttrsDescriptor

[alexbaden]

Adds the new AttrsDescriptor back and adds a __repr__ method so we can easily serialize it to the generated Inductor code.

I am leaving this draft as the changes for both the __repr__ method and Inductor changes are under review.

Close #2421

[alexbaden]

PyTorch Inductor tests in progress: https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/11409014945
https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/11418670546
https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/11441548261

Inductor tests passed: https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/11442335416

[alexbaden]

@whitneywhtsang this is ready for review.

[whitneywhtsang]

The change LGTM, can we squash the last 3 commits, and do not squash and merge this PR, so they we can keep the commit history?

[alexbaden]

The change LGTM, can we squash the last 3 commits, and do not squash and merge this PR, so they we can keep the commit history?

Done. I only have squash permissions, can you do the rebase and merge?

[whitneywhtsang]

The change LGTM, can we squash the last 3 commits, and do not squash and merge this PR, so they we can keep the commit history?

Done. I only have squash permissions, can you do the rebase and merge?

Thanks, merged.