Add storage settings for enphase_envoy batteries without enpower device

[catsmanac]

Proposed change

When using batteries with the Enphase Envoy, the enphase_envoy integration supports changing battery storage settings charge from grid, Storage mode and Reserve battery level, provided an Enpower device is present in the configuration.

The Enpower device is available when using an Enphase IQ System Controller. This device is not available in many EU countries and in these countries the batteries are installed without it providing no Enpower device.

Changing the actual settings is however done in the Envoy and not in the Enpower device and can be done without the Enpower device being present. The needed entities are currently only created if an Enpower device is present in the configuration.

This PR:

• Does not change behavior if Enpower device is present, entities remain connected to the Enpower device
• Will create the needed entities also if batteries are present but no Enpower device is found
  • Connects these entities to the Envoy device in this case
  • Allows changing these setting similar as when connected to the Enpower device
• Adds a new test fixture with the EU battery configuration
• Adds new tests and updated snapshot files for this case

Note: This may not work with latest released Enphase Envoy firmware release >= 8.2.42nn as this seems to break with installed Enpower device.

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: Enphase Envoy does not show battery switch (charging ON/OFF) (or total charge / discharge energy) #121159 and Enphase Envoy does not show switches for charge_from_grid in the UK with Monitored GW and IQ5 Battery #125217
• Link to documentation pull request: 34647

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

Hey there @bdraco, @cgarwood, @joostlek, mind taking a look at this pull request as it has been labeled with an integration (enphase_envoy) you are listed as a code owner for? Thanks!

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[joostlek]

We should remove the if statement, so rather just put the serial numbers as parameter.I think

[catsmanac]

We should remove the if statement, so rather just put the serial numbers as parameter.I think

These are now removed.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[ahullah]

+1 on this PR, thank you @catsmanac

[catsmanac]

+1 on this PR, thank you @catsmanac

Be aware this very well may not work with Envoy firmware 8.2.42nn as that has changed behavior for battery settings. #123216 reports that for 8.2.4286. You have 8.2.4225, so it may work or not.