Add command for setting SOC to the car simulator

[nzbr]

Describe your changes

Extends the car simulator with a command that may be used to set the SOC to a custom value before plugging it in.
The command can be used with set_soc <soc>, where the soc argument is parsed as a floating point number that must be in the interval [0,100].

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• I read the contribution documentation and made sure that my changes meet its requirements