Is your feature request related to a problem? Please describe.
llama.cpp server added reranking functionalities https://github.com/ggml-org/llama.cpp/blob/a4837577aae59c0ae640f3810094724bcac6bb28/examples/server/server.cpp#L2506

Describe the solution you'd like
Implement reranking also in the llama.cpp backend of LocalAI

Describe alternatives you've considered

Additional context