Werk #3878: apc_symmetra: divided into several checks

Now the check is more clearer and each check has its own, already existing WATO group.

The separation of apc_symmetra is as follows: - apc_symmetra monitors some states and battery aspects (as before) - apc_symmetra.temp reports the battery temperature - apc_symmetra.elphase reports the battery current - apc_symmetra_input checks the electrical inphase - apc_symmetra_output checks the electrical outphase

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