S_LED use options

[earth4s]

Is your feature request related to a problem? Please describe.
Create a way to utilize the S_LED in different ways depending on the users preference.

Describe the solution you'd like
Have a cli and/or UI options to set the function of the S_LED in a preset way.
Examples:

1. Rapid Blink when flashing a node
2. SOS blink (Morse code) if there's an error (booting a module failed, BMC boot fail, etc)
3. Mirror NIC data transmit LED
4. Like on some servers, have an illumination button for the LED (Solid/blink) to identify the server you want to physically work on if there are multiple Turing PIs being used.
5. Stay on once BMC is finished booting and is in a ready state
6. Heartbeat, blink once every "X" seconds (programable)

Some options can probably be set and utilized at the same time. Maybe add a precedence level to choose which option has a higher priority.