Update cmake files

[metascroy]

Main updates are:

• Add config file so that torchao can be used by find_package
• Rename TORCHAO_OP_EXECUTORCH_BUILD to TORCHAO_BUILD_EXECUTORCH_OPS
• Rename BUILD_KLEIDI to TORCHAO_BUILD_KLEIDIAI (and guard fetchcontent behind this)
• Use GLOB for op_linear_8bit_act_xbit_weight_executorch

Test plan:

sh build_torchao_ops.sh executorch
python tests/test_linear_8bit_act_xbit_weight_quantizer.py

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/1070

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✅ You can merge normally! (1 Unrelated Failure)

As of commit a3f52f0 with merge base e7b33bc ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Regression Tests / test (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://download.pytorc... / linux-job (gh) (trunk failure)

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[metascroy]

@larryliu0820 I removed the cmake config from this PR. Did you have any other concerns?