Add CuTeDSL backend for FP8 2:4 sparse conversion and linear, on by default

[alexsamardzic]

This PR is #4699 + #4730 + #4745 together, with CuTeDSL 2:4 sparsity kernels used everywhere by default, instead of corresponding C++/CUTLASS kernels.

[alexsamardzic]

Stack from ghstack (oldest at bottom):

• -> Add CuTeDSL backend for FP8 2:4 sparse conversion and linear, on by default #4803

[pytorch-bot]

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❌ 5 New Failures

As of commit bd35df7 with merge base 46e106b ():

NEW FAILURES - The following jobs have failed:

• Run Regression Tests / test (CPU 2.13, linux.4xlarge, torch==2.13.0 torchvision==0.28.0 --index-url https://download.pyt... / linux-job (gh)
  RuntimeError: Command docker exec -t 331a660c75d7f459a1d6b5f114647a1fc6856c9a589a1ee3a6a59d2f5bcc5b5b /exec failed with exit code 2
• Run Regression Tests / test (CUDA 2.13, linux.g5.12xlarge.nvidia.gpu, torch==2.13.0 torchvision==0.28.0 --index-url http... / linux-job (gh)
  RuntimeError: Command docker exec -t 3f51048285afdaa0a5e56c7603145714890025bb11e2734022f2b604c77049ec /exec failed with exit code 2
• Run Regression Tests / test-nightly (CPU Nightly (Clang), linux.4xlarge, --pre torch torchvision --index-url https://dow... / linux-job (gh)
  RuntimeError: Command docker exec -t 3bb35b13cf2683ea982421b119f53d23c2550dd0ddb9e64316249e28a1934fc8 /exec failed with exit code 2
• Run Regression Tests / test-nightly (CPU Nightly, linux.4xlarge, --pre torch torchvision --index-url https://download.py... / linux-job (gh)
  RuntimeError: Command docker exec -t c040a4413b592309766be423b24dad9604e79d844dc8fc203e2dc7a47a3de69e /exec failed with exit code 2
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch torchvision --index-url htt... / linux-job (gh)
  RuntimeError: Command docker exec -t 13c20f82a2c0b671fa4dc3eddbac00686168b42942cad7cefb4260d7cc31473c /exec failed with exit code 2

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