Breaking change

hold and away mode config settings will be deprecated and removed with release 2022.9. This will break existing integrations that make use of these config settings. Integrations should use the new preset_mode configuration options.

Proposed change

This PR simplifies the use of preset_modes with the MQTT climate platform.
This is a follow up on https://developers.home-assistant.io/blog/2019/07/03/climate-cleanup/.
It will introduce a preset_mode_command_topic, preset_mode_command_template, preset_mode_state_topic and preset_mode_value_template to replace the current hold and away mode settings.

The following configuration settings will be deprecated:

• away_mode_command_topic
• away_mode_state_topic
• away_mode_state_template
• hold_mode_command_topic
• hold_mode_command_template
• hold_mode_state_topic
• hold_mode_state_template
• hold_mode_state_template
• hold_modes

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 #
• This PR is related to issue:
• Link to documentation pull request: MQTT climate preset_mode rework home-assistant.io#21547

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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