Add option for xmonad to just use a precompiled binary

[locallycompact]

Hi, the way home manager assumes that it needs to compile xmonad is causing me issues if my xmonad window manager binary is its own standalone project. What I want to do is this:

{ xmonad-bin }:
{ config, lib, pkgs, inputs, ... }: {

  home-manager.users.lc = {
    xsession.windowManager.xmonad = {
      enable = true;
      haskellPackages = null;
    };
    home.file.".cache/xmonad/xmonad-x86_64-linux".source = "${monad-bin}/bin/xmonad-x86_64-linux";
  };
}

This errors because it expects to be able to read haskellPackages but this is a redundant code path for me. Can we have an xmonadPkg option that puts a prebuilt binary at the expected location like so?

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