chat : add qwen3 specialized parser (#26252)

* Add tagged thinking tool parser

* chat : refactor and add permute helper

* cont : add support for <tool_call> omission

* cont : update tool delimiters

* cont : add comment for qwen3-coder

* cont : fix trigger pattern for <function

---------

Co-authored-by: Bart de Boer <bart.deboer@gmail.com>

common/chat-peg-parser.h

@@ -55,6 +55,8 @@ class common_chat_peg_minimax_m3_mapper : public common_chat_peg_mapper {
 struct content_structure;
 struct tool_call_structure;
 
+constexpr size_t COMMON_CHAT_MAX_PERMUTE = 6;
+
 class common_chat_peg_builder : public common_peg_parser_builder {
   public:
     // Tag constants (from former common_chat_peg_base_builder)
@@ -105,6 +107,9 @@ class common_chat_peg_builder : public common_peg_parser_builder {
     common_peg_parser tool_arg_json_value(const common_peg_parser & p) { return tag(TOOL_ARG_VALUE, p); }
 
 
+    // Matches every parser exactly once, in any order.
+    common_peg_parser permute(const std::string & rule_prefix, const std::vector<common_peg_parser> & parsers);
+
     // Return a parser that parses the prefix of a string, up to a given delimiter.
     common_peg_parser prefix(const std::string & s, const std::string & delimiter = {});