V4 RelationManager Class must be declared abstract or implement methods

public function getSelectedTableRecordsQuery(
        bool $shouldFetchSelectedRecords = true,
        ?int $chunkSize = null
    ): Builder {
        // TODO: Implement getSelectedTableRecordsQuery() method.
    }

    public function isTableColumnToggledHidden(string $name): bool
    {
        // TODO: Implement isTableColumnToggledHidden() method.
    }