Add support for other AUR helpers

Currently the script only supports yay, paru, and pikaur. It'd be nice if it also supported other aur helpers such as rua or aurutils (Specifically, I use rua)

For those wondering, you can get around this by simply installing `brave-bin` through your aur helper

Start by reading install.sh and find how the script detects or invokes yay, paru, and pikaur. Extend that support to rua and aurutils, then verify that installing brave-bin works through each supported helper.

Written by the indexing model from the issue text.