Update sensor.py

[HAEdwin]

• Correction made to the key for Infoevent
• Added entity Infoevent_counter
• Removed invalid device class temperature for entities with flow and m3
• Add serial number sensor

[codecov[bot]]

Codecov Report

Base: 74.11% // Head: 74.70% // Increases project coverage by +0.58% :tada:

Coverage data is based on head (d72fb8f) compared to base (54d930b). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ========================================== + Coverage 74.11% 74.70% +0.58% ========================================== Files 7 7 Lines 340 340 ========================================== + Hits 252 254 +2 + Misses 88 86 -2 ``` | [Impacted Files](https://codecov.io/gh/golles/ha-kamstrup_403/pull/73?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/73?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL3NlbnNvci5weQ==) | `94.11% <ø> (ø)` | | | [...tom\_components/kamstrup\_403/pykamstrup/kamstrup.py](https://codecov.io/gh/golles/ha-kamstrup_403/pull/73?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sander#diff-Y3VzdG9tX2NvbXBvbmVudHMva2Ftc3RydXBfNDAzL3B5a2Ftc3RydXAva2Ftc3RydXAucHk=) | `52.63% <0.00%> (+1.50%)` | :arrow_up: | 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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[golles]

Thanks!