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/enum.go

@@ -2,6 +2,7 @@ package schema
 
 import (
 	"errors"
+	"github.com/openai/openai-go"
 	"reflect"
 
 	"golang.org/x/exp/slices"
@@ -19,6 +20,14 @@ func (e enum) SchemaType() jsonschema.DataType {
 	return jsonschema.String
 }
 
+func (e enum) FunctionParameters() openai.FunctionParameters {
+	return openai.FunctionParameters{
+		"type":        "string",
+		"description": e.Description(),
+		"enum":        e.values,
+	}
+}
+
 func (e enum) Definition() jsonschema.Definition {
 	def := e.basic.Definition()
 	def.Enum = e.values