databases/R-cran-dtplyr: New port: Data Table Back-End for 'dplyr'

• Submitter becomes maintainer

Provides a data.table backend for 'dplyr'. The goal of 'dtplyr' is to allow you
to write 'dplyr' code that is automatically translated to the equivalent, but
usually much faster, data.table code.

WWW: https://dtplyr.tidyverse.org/

Differential Revision: https://reviews.freebsd.org/D43735