[Preview] Integrated GPU / Intel GPU support through SYCL.

[ssheorey]

• SYCL support for Tensor ops.

  • Reduction ops

• SYCL support for linear algebra.

• Update C++ unit tests. These can be run locally, but do not run on GIthub since no integrated or discrete GPU is available.

• Update Python unit tests.

• Build preview sycl wheel [Python 3.10 only]

• Reduce tensor indexer MAX_DIMS from 10 to 5.

TODO:

• Fix SYCL [BUILD_SHARED_LIBS=OFF] CI out of storage github issue.
• Build wheels for other Python versions.
• Optimize SYCL kernels (especially reduction).
• SYCL support for nearest nbr search.
• SYCL support for hash grids.
• Custom kernels with ParallelFor for supporting geometry operations.

Type

• Bug fix (non-breaking change which fixes an issue): Fixes #
• New feature (non-breaking change which adds functionality). Resolves #
• Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

Checklist:

• I have run python util/check_style.py --apply to apply Open3D code style
  to my code.
• This PR changes Open3D behavior or adds new functionality.
  • Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is
    updated accordingly.
  • I have added or updated C++ and / or Python unit tests OR included test
    results (e.g. screenshots or numbers) here.
• I will follow up and update the code if CI fails.
• For fork PRs, I have selected Allow edits from maintainers.

Description

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.