Add rust build tools

As much as I wanted to avoid using cargo and just stick to guix, Cargo
is just really nice and also `guix shell rust-rand` with rustc didn't
actually work

home/sanderson-home.scm

@@ -44,6 +44,7 @@
 											"emacs-ligature"
 											"emacs-magit"
 											"emacs-paredit"
+											"emacs-rustic"
 											"emacs-sly"
 											"emacs-swiper"
 											"emacs-which-key"
@@ -88,6 +89,9 @@
 											"picom"
 											"pinentry-qt"
 											"python"
+											"rust"
+											"rust-analyzer"
+											"rust-cargo"
 											"rofi-wayland"
 											"sbcl"
 											"skribilo"