Deprecate legacy Sonos grouping services

[jjlawren]

Breaking change

The sonos.join and sonos.unjoin services will be removed in 2022.8 in favor of the standard media_player.join and media_player.unjoin services.

Proposed change

Deprecates the sonos.join and sonos.unjoin services in favor of the standard media_player services. This will also allow removal of the remaining "master" terminology references as a followup to #71206.

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)
• 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 #
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• Link to documentation pull request:

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[probot-home-assistant]

Hey there @cgtobi, mind taking a look at this pull request as it has been labeled with an integration (sonos) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[frenck]

This PR is missing a documentation PR.

@jjlawren Please open up a PR to adjust the documentation for this change.

[jjlawren]

Thanks for reminding. Done in home-assistant/home-assistant.io#22616.