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/basic.go

@@ -2,6 +2,7 @@ package schema
 
 import (
 	"errors"
+	"github.com/openai/openai-go"
 	"reflect"
 	"strconv"
 
@@ -13,6 +14,7 @@ var _ Type = basic{}
 
 type basic struct {
 	jsonschema.DataType
+	typeName string
 
 	// index is the position of the parameter in the StructField of the function's parameter struct
 	index int
@@ -29,6 +31,13 @@ func (b basic) SchemaType() jsonschema.DataType {
 	return b.DataType
 }
 
+func (b basic) FunctionParameters() openai.FunctionParameters {
+	return openai.FunctionParameters{
+		"type":        b.typeName,
+		"description": b.description,
+	}
+}
+
 func (b basic) Definition() jsonschema.Definition {
 	return jsonschema.Definition{
 		Type:        b.DataType,