Add config flow for enphase envoy

[bdraco]

Breaking change

Enphase Envoy has fully transitioned to configuration via UI. YAML configuration will be removed in an upcoming version. Existing YAML configuration will be imported automatically, and can now safely be removed from your configuration files.

All sensors are now configured by default. Each inverter has a unique id and can now be disabled in the UI.

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Update enphase_envoy for config flow home-assistant.io#17192

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.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

To help with the load of incoming pull requests:

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

[probot-home-assistant]

Hey there @gtdiehl, mind taking a look at this pull request as its been labeled with an integration (enphase_envoy) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[bdraco]

Thanks. Retested 👍