Add multiphase support for MQTT Powermeter

[google-labs-jules]

This PR adds support for multiphase monitoring via MQTT. It allows users to configure multiple topics or multiple JSON paths for a single topic (or a mix) to capture power readings for 3 phases. It is backwards compatible with existing single-phase configurations. It also fixes a circular dependency issue in the configuration loading module.

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PR created automatically by Jules for task 2129703107278789099 started by @tomquist

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