Add ability to create custom entities

[denpamusic]

Is there an existing issue for this?

• [X] I have searched the existing issues

I want to suggest:

• [ ] support for a new product
• [X] new functionality for a product
• [ ] documentation improvement
• [ ] other

Feature description

Related to: #41 Related to: #57

Add an ability to create arbitrary entities based from any values that are provided by ecoMAX controller or the connected devices, such as mixers and thermostats. Support adding sensor, binary sensor and number platforms via options flow. See:

• https://developers.home-assistant.io/docs/config_entries_options_flow_handler
• https://developers.home-assistant.io/docs/data_entry_flow_index

Webpage of the product, that I'm suggesting:

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My diagnostics data:

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Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[denpamusic]

Preview of options flow to create custom entities.

Main menu

Selecting entity type

Selecting new entity type

Filing in new entity details

[denpamusic]

This will now be tracked in PR: #76