llama : refactor sampling v2 (#9294)

- Add `struct llama_sampler` and `struct llama_sampler_i`
- Add `llama_sampler_` API
- Add `llama_sampler_chain_` API for chaining multiple samplers
- Remove `LLAMA_API_INTERNAL`
- Add `llama_perf_` API and remove old `llama_print_timings` and `llama_reset_timings`

common/CMakeLists.txt

@@ -58,8 +58,6 @@ add_library(${TARGET} STATIC
     sampling.cpp
     console.h
     console.cpp
-    grammar-parser.h
-    grammar-parser.cpp
     json.hpp
     json-schema-to-grammar.cpp
     train.h