Add missing EDL21 OBIS codes

[DAMEK86]

Breaking change

Proposed change

Iskraemeco MT175 supports instantaneous power for all phases. This results in multiple "Unhandled sensor detected" warnings in HA.
Missing OBIS codes for active instantaneous power phases are added, sensors appear in HA, and waring goes away.
Add support for instantaneous power for all phases (L1, L2, L3).

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
sensors:
  - platform: edl21
    serial_port: /dev/ttyAMA1

Additional information

• This PR fixes or closes issue: fixes EDL21: Unhandled sensor #39712
• This PR is related to issue:
• Link to documentation pull request:

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:

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To help with the load of incoming pull requests:

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

[homeassistant]

Hi @DAMEK86,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[probot-home-assistant]

Hey there @mtdcr, mind taking a look at this pull request as its been labeled with an integration (edl21) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[mtdcr]

Looks good to me. Thank you, @DAMEK86!

[MartinHjelmare]

Thanks!