Added support for Multical 402 additional Water meters

[AverageJoe89]

Support for additional water metters connected to Input A&B (VA, VB) on Multical 402 According to Multical 402 manual

and protocol reference for Multical 801

Up to two additional water meters (eg. for cold water) can be connected to Multical 402 and read over IR interface, those are stored in registries 84 and 85.

In my example, no.1 has cold water meter, no. 2 is disconnected.

Tested with Multical 402 Home Assistant 2023.2.5 Supervisor 2023.01.1 Operating System 9.5 Frontend 20230202.0 - latest

[golles]

Thank you for your contribution, I've added a few comments. If you can address those, I'm happy to accept this PR!

[codecov[bot]]

Codecov Report

Base: 75.76% // Head: 75.76% // No change to project coverage :thumbsup:

Coverage data is based on head (b94c145) compared to base (24e0e71). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #78 +/- ## ======================================= Coverage 75.76% 75.76% ======================================= Files 7 7 Lines 359 359 ======================================= Hits 272 272 Misses 87 87 ``` | [Impacted Files](https://codecov.io/gh/golles/ha-kamstrup_403/pull/78?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander) | Coverage Δ | | |---|---|---| | [custom\_components/kamstrup\_403/sensor.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/78?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL3NlbnNvci5weQ==) | `94.28% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander)

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[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[AverageJoe89]

Thanks, I will take a look on that.

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions[bot]]

This PR was closed because it has been stalled for 10 days with no activity.