Add programs.ydotool.enable config option to run required ydotoold daemon

[PAI5REECHO]

Describe the bug

ydotool requires ydotoold to be running in order to be used otherwise it aborts and crashes (see ReimuNotMoe/ydotool#153 (comment)). It would make sense to have a NixOS configuration option in order to automatically configure ydotoold to run.

Steps To Reproduce

$ lldb ydotool type 'This is a test.'
(lldb) target create "ydotool"
Current executable set to 'ydotool' (x86_64).
(lldb) settings set -- target.run-args  "type" "This is a test."
(lldb) process launch
Process 1660480 launched: '/nix/store/p7ibf7viqwhp63szy4jxqba9njf19yf7-ydotool-1.0.1/bin/ydotool' (x86_64)
failed to connect socket: Connection refused
Process 1660480 stopped
* thread #1, name = 'ydotool', stop reason = signal SIGABRT
    frame #0: 0x00007ffff7e4cc1f libc.so.6`__pthread_kill_implementation + 239
libc.so.6`__pthread_kill_implementation:
->  0x7ffff7e4cc1f <+239>: mov    ebp, eax
    0x7ffff7e4cc21 <+241>: neg    ebp
    0x7ffff7e4cc23 <+243>: cmp    eax, 0xfffff000
    0x7ffff7e4cc28 <+248>: mov    eax, 0x0
(lldb) thread backtrace
* thread #1, name = 'ydotool', stop reason = signal SIGABRT
  * frame #0: 0x00007ffff7e4cc1f libc.so.6`__pthread_kill_implementation + 239
    frame #1: 0x00007ffff7e02042 libc.so.6`raise + 18
    frame #2: 0x00007ffff7ded49c libc.so.6`abort + 194
    frame #3: 0x000000000040143c ydotool`main + 636
    frame #4: 0x00007ffff7dee237 libc.so.6`__libc_start_call_main + 103
    frame #5: 0x00007ffff7dee2f5 libc.so.6`__libc_start_main@@GLIBC_2.34 + 133
    frame #6: 0x0000000000401471 ydotool`_start + 33
(lldb)

Expected behavior

Some NixOS module option (perhaps programs.ydotool.enable) that automatically configures and runs ydotool as a systemd service in the background.

Notify maintainers

@WilliButz @kraem

Metadata

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.18.10, NixOS, 22.11 (Raccoon), 22.11.20220619.0d68d7c`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.10.0pre20220620_16c6c6c`
 - nixpkgs: `/nix/store/1njdlszpc3bchdcwk45c3ndb0nfmwqcr-source`

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/1724