Add Grid import export to Enphase Envoy

[catsmanac]

Proposed change

Implement net consumption (grid import) and net production (grid export) for Enphase envoy metered with installed and configured CT.

Added sensor entities:

• Envoy current net power consumption (positive/negative grid power exchange)
• Envoy lifetime net energy consumption (grid energy import)
• Envoy lifetime net energy production (grid energy export)

In the energy dashboard one can use Envoy lifetime net energy consumption for Grid consumption and Envoy lifetime net energy production for Return to grid.

These entities are also available for phases if more then 1 phase is configured in the Envoy.

Also added as disabled by integration, user can enable as needed:

• Envoy Frequency net consumption ct (grid frequency)
• Envoy Voltage net consumption ct (grid voltage)
• Envoy Metering status net consumption CT
• Envoy Meter status flags active net consumption ct
• Envoy Metering status production CT
• Envoy Meter status flags active production CT

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [x] 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 #82879 , #31426
• This PR is related to issue:
• Link to documentation pull request: https://github.com/home-assistant/home-assistant.io/pull/31491

Checklist

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

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

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

[home-assistant[bot]]

Hey there @bdraco, @cgarwood, @dgomes, @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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