Support Self extend for server (main is already supported)

Self extend is now supported for main: Link: https://github.com/ggerganov/llama.cpp/pull/4815
Link paper:  https://arxiv.org/pdf/2401.01325.pdf
It would be great if it was also supported for the server, any guidance or support is welcome!