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.

schema/array.go

@@ -2,6 +2,7 @@ package schema
 
 import (
 	"errors"
+	"github.com/openai/openai-go"
 	"reflect"
 
 	"github.com/sashabaranov/go-openai/jsonschema"
@@ -18,6 +19,14 @@ func (a array) SchemaType() jsonschema.DataType {
 	return jsonschema.Array
 }
 
+func (a array) FunctionParameters() openai.FunctionParameters {
+	return openai.FunctionParameters{
+		"type":        "array",
+		"description": a.Description(),
+		"items":       a.items.FunctionParameters(),
+	}
+}
+
 func (a array) Definition() jsonschema.Definition {
 	def := a.basic.Definition()
 	def.Type = jsonschema.Array