Configuration workflow and distribution fees support

Thanks to the great work done by @yardee on this sensor it now supports a configuration workflow, distribution fees, and rates for the next day!

The integration should not break the existing entries for backwards compatibility, but it's highly recommended you remove the platform: ote_rate from your sensors section and configure it via a workflow.

What's Changed

• Fix MWh unit in NATIVE_UNIT_OF_MEASUREMENT by @martin-klima in #1
• Configuration workflow with distribution fees by @yardee in #15
• Set correct version to integration info via const.py by @yardee in #17

New Contributors

• @martin-klima made their first contribution in #1
• @yardee made their first contribution in #15

Full Changelog: v0.1.2...v0.2.3

Fixed the one hour offset introduced in v0.1.1

Starting history attribute counter from 0 (to match date.hour);
This will remove the 1-hour offset - bug introduced in the previous release

Introduced daily rate forecast/history

Added current day rate history and forecast as attributes.

First working version

Still a bunch of stuff to do, but this works just fine (have been testing it for a few days).