sync : vendor (#13901)

* sync : vendor

ggml-ci

* cont : fix httplib version

ggml-ci

* cont : fix lint

* cont : fix lint

* vendor : move to common folder /vendor

ggml-ci

* cont : fix lint

* cont : move httplib to /vendor + use json_fwd.hpp

ggml-ci

* cont : fix server build

ggml-ci

* cont : add missing headers

ggml-ci

* cont : header clean-up

ggml-ci

common/json-schema-to-grammar.h

@@ -1,9 +1,9 @@
 #pragma once
 
-#include "ggml.h"
-// Change JSON_ASSERT from assert() to GGML_ASSERT:
-#define JSON_ASSERT GGML_ASSERT
-#include "json.hpp"
+#include <nlohmann/json_fwd.hpp>
+
+#include <functional>
+#include <string>
 
 std::string json_schema_to_grammar(const nlohmann::ordered_json & schema,
                                    bool force_gbnf = false);