* server : integrate speculative decoding
* server: Fix field names
* server: fix include, whitespace
* fix compile errors in speculative.cpp
* add llama_sampling_sample_and_accept_n to sampling
* finish porting speculative decoding in server
* port functions from common/speculative, common/sampling
* remove arg
* fix function names
* init params_dft to none
* correct value for n_ctx
* prefix kv cache tensors with model name to avoid conflict
* fix call arguments
* fix spec decoding args
* correct slot.id
* use n_max
* port the rest of sampling funcs
* fix func arguments
* slot.id starts at 1?
* Revert "prefix kv cache tensors with model name to avoid conflict"
This reverts commit fbd5dfd866.
* disable draft logging
* disable logging in speculative.cpp
in mainline, these would be LOG_DEBUG, but since ik_llama doesnt support
it, logging is disabled entirely
* add more draft model parameters
* fix
* pass flash_attn
* add speculative params for parity
* set speculative params in launch_slot_with_task instead
