Add sensor for water totalizer

[lmaertin]

Proposed change

Add sensor for water totalizer, i.e., Total water volume accumulated.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Pooldose: Add sensors for water meter core#157382
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[home-assistant]

It seems that this PR is targeted against an incorrect branch. Documentation updates which apply to our current stable release should target the current branch. Please change the target branch of this PR to current and rebase if needed. If this is documentation for a new feature, please add a link to that PR in your description.

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[Copilot]

Pull request overview

This pull request adds documentation for a new water totalizer sensor to the PoolDose integration. The totalizer sensor tracks the total accumulated water volume that has passed through the pool system.

Key changes:

• Added a new sensor entry "Totalizer" to the sensors list in the supported functionality section
• Documented the unit of measurement as L (liters) or m³ (cubic meters)

[lmaertin]

Why is the bot complaining? Next is correct.

[c0ffeeca7]

Thank you, @lmaertin 👍