[dx12] Add aot for dx12.

[python3kgae]

Only make sure the pipeline generate something. No real dxil generated yet.

Move DX12 build to gpu ci which will run the aot test.

Issue: #5276

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[ailzhang]

@python3kgae FYI we're going to merge https://github.com/taichi-dev/taichi/pull/5846 soon after branchcut for v1.1.3 tmr which might conflict with this PR, would you mind holding on this PR a bit and rebase on top of that once it's merged? Thanks a lot! cc: @strongoier @feisuzhu

[python3kgae]

@python3kgae FYI we're going to merge #5846 soon after branchcut for v1.1.3 tmr which might conflict with this PR, would you mind holding on this PR a bit and rebase on top of that once it's merged? Thanks a lot! cc: @strongoier @feisuzhu

Sure. I'll rebase once #5846 is in.

[python3kgae]

Nice work, thanks! Btw you can further add test cases with "[python] aot_save + [C++] aot_load_and_run", with reference to https://github.com/taichi-dev/taichi/pull/5594/files

Tried to make it work. But crash in void Kernel::operator()(LaunchContextBuilder &ctx_builder) {. Will add it next PR.