Preview release of the GPU version using SYCL

This is a preview release of SPHinXsys in GPU version.
Currently, only the dam-break cases are running on GPU.
Please feel free to fork, try and test the performance.

For installing this version, please follow the instruction from
https://www.sphinxsys.org/html/installation.html#installing-sycl-version-on-ubuntu

If you have any suggestion or comments, please use the issue and discussion page.
You can also contact me (xiangyu.hu@tum.de) for possible collaborations on the GPU version.