Add support for integers and tool configuration in schema handling

This update introduces support for `jsonschema.Integer` types and updates the logic to handle nested items in schemas. Added a new default error log for unknown types using `slog.Error`. Also, integrated tool configuration with a `FunctionCallingConfig` when `dontRequireTool` is false.

anthropic.go

@@ -147,7 +147,8 @@ func (a anthropic) requestToAnthropicRequest(req Request) anth.MessagesRequest {
 	res.Messages = msgs
 
 	if req.Temperature != nil {
-		res.Temperature = req.Temperature
+		var f = float32(*req.Temperature)
+		res.Temperature = &f
 	}
 
 	log.Println("llm request to anthropic request", res)