sampling : refactor init to use llama_sampling_params (#3696)
* sampling : refactor init to use llama_sampling_params
* llama : combine repetition, frequency and presence penalties in 1 call
* examples : remove embd-input and gptneox-wip
* sampling : rename penalty params + reduce size of "prev" vector
* sampling : add llama_sampling_print helper
* sampling : hide prev behind API and apply #3661
ggml-ci
