playground for energy transfer & transformation #1527

[stap-m]

Summary of the discussion

From oeo-dev-meeting 71: This PR contains the implementation of energy transfer und transformation (#1527) with respect to proposal from oeo-dev-meeting.

Idea of this PR is to try out the proposal for a couple of energy (transfern and/or transformation) processes.

Example 1: battery charging, see #1622

Workflow checklist

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