Add easyEnergy integration

[klaasnicolaas]

Proposed change

A new integration that uses the data from easyEnergy, interesting for those who have a dynamic energy contract.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Add docs for easyEnergy integration home-assistant.io#25871

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[frenck]

Looks a lot like energy_zero, which I guess helped a lot with creating this one 😄

Tested locally and works as expected. Code looks good 👍
Nice job!

../Frenck

[epenet]

This is blocking #87068
Do you feel like taking a look?

[epenet]

Warning: homeassistant/components/easyenergy/coordinator.py:36:23: W7431: Argument hass should be of type ['HomeAssistant', 'HomeAssistant | None'] in __init__ (hass-argument-type)

[klaasnicolaas]

Wouldn't it be easier to include the adjustment in your own pull request?

[epenet]

Possibly... but not sure if I will get a chance before Monday.

[frenck]

Fixed in #87371