[feat] New recipe commands

[matbme]

Now that the installation process for Vanilla OS is (somewhat) finalized, it's a good idea to create/improve some recipe commands in Albius to replace the more complex shell items from vanilla-installer. Below is a list of some of the commands we should consider working on:

• Mount/Unmount commands for post-install (needs to support overlay and bind mounts)
• [feat] Allow passing extra flags to grub-install #13
• Copy file from host to installed system, with support for printf-like substitution
• Make chroot parameter in post-install optional, and default it to true
• Basic filesystem operations (mkdir, rm, mv, chmod, ln, etc)
• File editing (sed-like)