ITS-GPU: Use typed external allocator for some thrust items

[mconcas]

This is an initial implementation of custom allocation for thrust_device buffers.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[alibuild]

Error while checking build/O2/fullCI_slc9 for dc0a934 at 2025-06-06 21:09:

## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/14371-slc9_x86-64/0/GPU/GPUTracking/Global/GPUChainITS.cxx:33:8: error: annotate this function with 'override' or (rarely) 'final' [modernize-use-override]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 851dc67 at 2025-06-07 03:25:

## sw/BUILD/ONNXRuntime-latest/log
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: libdrm/drm.h: No such file or directory
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
/opt/rocm/include/rocm_smi/kfd_ioctl.h:26:10: fatal error: 'libdrm/drm.h' file not found
ninja: build stopped: subcommand failed.

Full log here.