Add support for MQTT based ecovacs vacuums

[edenhaus]

Breaking change

Proposed change

Add support for MQTT based ecovacs vacuums by adding the library deebot_client
Login and getting all devices is handled by the new library.
If we get back a legacy device, we use the old library to communicate with it.
As Ecovacs calls them legacy devices, I have renamed the existing Vacuum entity to EcovacsLegacyVacuum
Removed continent from the config flow as it will be retrieved from the country.
Enabled strict typing

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 Can't control my Deebot (Ping did not reach VacBot. Will retry) #38625
• This PR is related to issue:
• Link to documentation pull request: Clean up ecovacs documentation home-assistant.io#30872

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.

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[home-assistant]

Hey there @OverloadUT, @mib1185, mind taking a look at this pull request as it has been labeled with an integration (ecovacs) you are listed as a code owner for? Thanks!

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[edenhaus]

Removing the continent requires no migration, as no stable release included the config flow of ecovacs

[mib1185]

HI @edenhaus
i've tested this PR with my old Deebot slim 2 (xmpp based) and can confirm that it still works.

• migration of yaml ✅
• creating new entry ✅
• controlling the vacuum ✅

[MartinHjelmare]

Thanks!

Stale

[edenhaus]

Test failures unrelated