datastore/metadata.go
func Kinds(ctx context.Context) ([]string, error) {
	// TODO(djd): Support range queries.
	q := NewQuery(kindKind).KeysOnly()
	keys, err := q.GetAll(ctx, nil)
	if err != nil {
		return nil, err
	}
	return keyNames(keys), nil
}
func Kinds(ctx context.Context) ([]string, error) {
	// TODO(djd): Support range queries.
	q := NewQuery(kindKind).KeysOnly()
	keys, err := q.GetAll(ctx, nil)
	if err != nil {
		return nil, err
	}
	return keyNames(keys), nil
}
// Kinds returns the names of all the kinds in the current namespace.