Implement OpenWB Series 2 EVCS

[sthhs]

This PR extends and replaces #3237.
The component requests the actual power, voltage, current, plug state, charge state and energy values from an OpenWB Series 2 with one or two internal charge points in primary mode, which is commonly used. In this case the wallbox can only be monitored from other systems with http requests and can not be controlled.
The purpose is displaying and archiving the most important values in OpenEMS.
The pictures show the corresponding energy meter values in the OpenWB GUI and in OpenEMS at nearly the same moment.

These channels can be requested from the internal charge point:

The evcs modal widget, showing the current charge power:

And after the charging has finished:

The charged energy is calculated from the difference of the actual imported energy from the OpenWB and the value at the time when the car is plugged in. The values from the OpenWB monitoring and this component are the same:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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HEAD has 1 upload less than BASE

Flag	BASE (30b5e78)	HEAD (c9b0882)
java	1	0

Additional details and impacted files

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- Coverage      59.83%   30.61%   -29.21%     
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  Lines         120785     7586   -113199     
  Branches        9015     1288     -7727     
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- Hits           72260     2322    -69938     
+ Misses         45837     5143    -40694     
+ Partials        2688      121     -2567     

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[Sn0w3y]

Maybe add this to an "enum" Package as in other Implementations? :)

[sthhs]

Done

[Sn0w3y]

See my comment :)