Add sensor for Ecowitt raw soil moisture value

[dcmeglio]

Proposed change

#109817 prevents the warning message that is reported in #102738 but this is because aioecowitt now actually recognizes the soilad# sensors. This PR supports the Soil AD # sensor values as a disabled by default diagnostic sensor in case someone has need for the raw values within HA,

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)
• 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 #
• This PR is related to issue: Ecowitt: Unhandled sensor type soilad1 value 208 #102738
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[home-assistant]

Hey there @pvizeli, mind taking a look at this pull request as it has been labeled with an integration (ecowitt) you are listed as a code owner for? Thanks!

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