feat: align argsort with PyTorch parameter order

[voltjia]

Summary

• Add the PyTorch-compatible argsort(input, dim, descending, stable, out) interface and trailing-default overloads.
• Keep the previous input, stable, dim, descending, out interface as an explicitly deprecated overload and cover both paths in the existing operator test module.

Motivation

The current public parameter order follows neither the PyTorch Python API nor its positional semantics. This change makes the primary InfiniOps interface match torch.argsort, while preserving a migration path for existing callers.

No standalone issue is associated with this alignment follow-up.

Type of Change

• feat - new feature / new operator / new platform
• fix - bug fix
• perf - performance improvement (no behavioral change)
• refactor - code restructuring without behavior change
• test - adding or fixing tests only
• docs - documentation only
• build / ci - build system or CI configuration
• chore - tooling, formatting, or other non-code changes
• Breaking change

Platforms Affected

• CPU (WITH_CPU)
• NVIDIA (WITH_NVIDIA)
• Iluvatar (WITH_ILUVATAR)
• MetaX (WITH_METAX)
• Cambricon (WITH_CAMBRICON)
• Moore (WITH_MOORE)
• Ascend (WITH_ASCEND)
• PyTorch C++ bindings (WITH_TORCH)
• Build system / CMake / CI
• Python bindings / user-facing API

Smoke Test Result

Host: ssh nvidia
Image: accelerator-dev/nvidia:latest
PyTorch: 2.10.0a0+b4e4ee8

cmake ... -DWITH_CPU=ON -DWITH_NVIDIA=ON -DWITH_TORCH=ON \
  -DINFINI_OPS_OPS=argsort -DINFINI_OPS_TORCH_OPS=argsort
cmake --build build-nvidia --target ops -j 16
Build passed.

python -m pytest tests/test_argsort.py --devices cpu cuda -q
5 passed

Test Results on Supported Platforms

Platform	Affected	Build / Smoke Result	Full Result / Notes
CPU	Yes	targeted build passed	Targeted public and deprecated overload cases passed
NVIDIA	Yes	targeted build passed	Targeted public and deprecated overload cases passed
Iluvatar	No	N/A - not affected	N/A - not affected
MetaX	No	N/A - not affected	N/A - not affected
Cambricon	No	N/A - not affected	N/A - not affected
Moore	No	N/A - not affected	N/A - not affected
Ascend	No	N/A - not affected	N/A - not affected

Additional validation

python -m pytest tests/test_generate_wrappers.py tests/test_generate_torch_ops.py -q
25 passed

clang-format 21.1.8 --dry-run --Werror: passed
Ruff check and format check: passed

Benchmark / Performance Impact

N/A. This changes API routing only; the underlying ATen implementation is unchanged.

Notes for Reviewers

API alignment

Interface	Signature	Alignment basis
InfiniOps primary interface	argsort(input, dim=-1, descending=False, stable=False, out)	PyTorch parameters in Python order; explicit out remains last per CONTRIBUTING.md.
PyTorch public API	torch.argsort(input, dim=-1, descending=False, stable=False, *, out=None)	Pinned PyTorch source

• Prefix overloads provide each trailing Python default without adding a separate policy/configuration file.
• The previous argsort(input, stable, dim, descending, out) constructor and call operator remain available with [[deprecated]] migration diagnostics.