docker : add build for SYCL, Vulkan + update readme (#5228)
* add vulkan dockerfile
* intel dockerfile: compile sycl by default
* fix vulkan dockerfile
* add docs for vulkan
* docs: sycl build in docker
* docs: remove trailing spaces
* docs: sycl: add docker section
* docs: clarify install vulkan SDK outside docker
* sycl: use intel/oneapi-basekit docker image
* docs: correct TOC
* docs: correct docker image for Intel oneMKL
