Formatter for Perl

**Formatter tool**
[Name of the tool and link to context]

[perltidy](https://perltidy.sourceforge.net/)

**Filetype(s)**
[Applicable languages/filetypes you'd like to use this tool to format]

* perl

**Additional context**
[Add any other context or screenshots about the feature request here.]

Review the repository's existing formatter integrations and the perltidy context linked in the issue. Determine how Perl file types should be connected to perltidy and what behavior existing formatters establish. Done means Perl files can be formatted through vim-codefmt using perltidy.

Written by the indexing model from the issue text.