[esimd] The plan of ESIMD in the future

1. Will ESIMD support new Intel GPUs in the future?
Like B60/70 and the coming Intel GPU.

2. Will ESIMD support old Intel GPU (like Arc770) in new oneAPI release?
I see Arc770 is removed from the comment of ESIMD exmple code: https://github.com/intel/llvm/tree/sycl/sycl/test-e2e/ESIMD.

Review the ESIMD end-to-end area at sycl/test-e2e/ESIMD, including the example comments that mention Arc770, and check the project’s current GPU support and release information. The issue is asking for a future support plan, so the expected outcome and implementation entry point still need to be defined by maintainers.

Written by the indexing model from the issue text.