snmp: Better sensor support to resolve previous issues

[lextm]

Breaking change

Proposed change

We picked up the work done by @ChristianKuehnel in #11239 and added simpler test cases for review.

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 SNMP sensor and OPAQUE data type #112392 and SNMP sensor not processing float values (correctly) #2767
• 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
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format 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.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

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

[janiversen]

LGTM, thanks

[bdraco]

Thank you for your contribution thus far! 🎖 Since this is a significant contribution, we would appreciate you'd added yourself to the list of code owners for this integration. ❤️

Please, add your GitHub username to the manifest.json of this integration.

For more information about "code owners", see: Architecture Decision Record 0008: Code owners.

[janiversen]

Please do so in a new Pull Request.

The advantage being, that you get notified automatically on new issues, which of course is interesting presuming you use the integration.

[lextm]

@bdraco Thanks for the advice, but like you might discover the changes were made by @ChristianKuehnel, not us.

Our team will keep an eye on HA SNMP related features from time to time and provide support if possible as upstream component (pysnmp-lextudio) owner, but we are clearly not yet at the HA code owner stage.