Departure time patches

[Abby-Wheelis]

Describe your changes

additions of charging_session_timer, end_of_profile_schedule, sim_speed, and departure_time to the iso15118/evcc_comm_session_handler.py file to initialize these values used in the schedule calculation that includes departure time
addition of EAmount and DepartureTime to the EVState class definition
changes in iso15118/controller/simulator.py which convert hardcoded EAmount and DepartureTime with variables in the EVEREST_EV_STATE and include calculating a power curve based on the requested departure time and publishes it via mqtt
additions to iso15118/evcc/states/iso15118_2_states.py to handle the end of the charging profile

Issue ticket number and link

#220

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

Opening PR as a draft to continue the conversation about the changes.

[SebaLukas]

I will have a look next week

[SebaLukas]

I had a first look and what I immediately noticed.

• Please do not use prints, but the log functions accordingly.
• There must be an alternative that Josev does not publish/subscribe directly to mqtt (everest_external/nodered/..). If we allow something like that here, I can no longer guarantee that the EV sim will work. Especially with different versions of NodeRed config jsons.