Allocate identifier for Trino's ORC writer in Footer.writer
Presto has had ORC writer at least since dain implemented it in 2017. Presto codebase has diverged into community's PrestoSQL and facebook's PrestoDB in January 2019. In December 2020 the PrestoSQL branch was renamed to Trino (https://trino.io/blog/2020/12/27/announcing-trino.html). The Trino's (formerly PrestoSQL's) writer should be now treated as separate from prestodb's writer, as the implementations are independently maintained.