passage: add additional deps to wrapper

I realized that passage won't work properly in e.g. systemd units as
these don't have `/run/current-system/sw/bin` inside their `PATH` and
thus globally installed things like `coreutils` are not available there.

Added the following tools now:

* `coreutils` for `base64` & `shred` (most notably `passage show`).
* `wl-clipboard` for copying things to the clipboard on Wayland (most
notable `passage show -c`).
* `gnused` for `sed` (most notably `passage show`).
* `gnugrep` for `grep` (for `passage grep`).
* `findutils` for `find` (most notably `mv`/`cp` - used in
`reencrypt_path()`).

Decided against adding stuff like `feh`/`gm` for showing a QR code.
These are optional and the script falls back to printing the QR code on
CLI.

pkgs/tools/security/passage/default.nix

···
 , substituteAll
 , age
 , getopt
+, coreutils
+, findutils
+, gnugrep
+, gnused
+, qrencode ? null
+, wl-clipboard ? null
 , git ? null
 , xclip ? null
 # Used to pretty-print list of all stored passwords, but is not needed to fetch
···
 
   nativeBuildInputs = [ makeBinaryWrapper ];
 
-  extraPath = lib.makeBinPath [ age git xclip tree ];
+  extraPath = lib.makeBinPath [
+    age
+    coreutils
+    findutils
+    git
+    gnugrep
+    gnused
+    qrencode
+    tree
+    wl-clipboard
+    xclip
+  ];
 
   # Using $0 is bad, it causes --help to mention ".passage-wrapped".
   postInstall = ''