Add roborock mop features

[rogelio-o]

Proposed change

Add mop features to xiaomi_miio integration: mop_mode and mop_intensity.

Type of change

It includes both attributes (mop_mode and mop_intensity) as an attribute of the vacuum entity and two services (set_mop_mode and set_mop_intensity) to change them.

• 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 Roborock S7 MaxV: No Mop, Water Data Pulled into HomeAssistant #69869
• 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
• The code has been formatted using Black (black --fast 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.

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

[home-assistant]

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

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[rytilahti]

Thanks for the PR @rogelio-o! Alas, I am not going to accept this as we are currently in progress to clean up the integration by moving all model-specific information to the backend library to simplify the maintenance. You can see some details at rytilahti/python-miio#1114 and rytilahti/python-miio#1495 .

For the roborock mop features described in this PR, @starkillerOG has been working on getting those features implemented: rytilahti/python-miio#1543