Add collection for csv-mode

[magthe]

Brief summary of what the package does

csv-mode offers a mode to work with CSV files in Emacs.

There aren't many bindings yet, mostly because I've just started using csv-mode myself. The reason for wanting support in evil-collection is that evil overrides the mode's binding for TAB.

Direct link to the package repository

• https://elpa.gnu.org/packages/csv-mode.html
• https://www.emacswiki.org/emacs/CsvMode

Checklist

• [x] byte-compiles cleanly
• [x] M-x checkdoc is happy. Don't manually write (provide 'evil-collection-mpc), M-x checkdoc can do it automatically for you
• [x] define evil-collection-mpc-setup with defun
• [x] define evil-collection-mpc-mode-maps with defconst
• [x] All functions should start with evil-collection-mpc-