feat(wpcarro/emacs): Add fns to list.el

new functions:
- duplicate
- last
- delete
- wrap

also:
- drop support for `list-head` (in favor of `list-first`)
- add optional arg to first

Change-Id: If3c48d4749a3bc5a853995996fa02a65a4076a10
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6041
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/emacs/.emacs.d/wpc/stack.el

@@ -46,7 +46,7 @@
   "Look at the top element of `XS' without popping it off."
   (->> xs
        stack-xs
-       list-head))
+       list-first))
 
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