next ollama runner

implement llama and mllama model architectures in go using ggml (through
cgo)

llama/llama.cpp/common/json-schema-to-grammar.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include "ggml.h"
+// Change JSON_ASSERT from assert() to GGML_ASSERT:
+#define JSON_ASSERT GGML_ASSERT
+#include "json.hpp"
+
+std::string json_schema_to_grammar(const nlohmann::ordered_json& schema);