Delay a job on startup

[IlyaSergeevich0]

Closes #435

Used TimeSpanHelper to parse delay.

Feature works fine on standalone.

[IlyaSergeevich0]

@Trojaner after second thought, should I implement same behavior for @single_exec and @reboot?

[Trojaner]

Sounds like a good idea

[IlyaSergeevich0]

Works fine on standalone

Jobs config:

jobs:
- name: OpenMod Auto Update
  args:
    commands:
    - openmod upgrade
  task: openmod_command
  schedule: 0 0 * * 0
  enabled: true
  
- name: Delay startup command
  args:
    commands:
    - test_startup_command
  task: openmod_command
  schedule: '@startup:5s'
  enabled: true

- name: Delay reboot command
  args:
    commands:
    - test_reboot_command
  task: openmod_command
  schedule: '@reboot:5s'
  enabled: true

- name: Delay single execution command
  args:
    commands:
    - test_single_exec_command
  task: openmod_command
  schedule: '@single_exec:5s'
  enabled: true

Log before om reload: openmod-2023-11-15-16-22-31.log

Log after om reload: openmod-2023-11-15-16-22-41.log

[Trojaner]

Thank you for your contribution.

[Trojaner]

Can you document this in the docs as well?

[IlyaSergeevich0]

Sure, I'll create a new PR for this