Add mitsubishi_itp Component

[Sammy1Am]

Description:

Adding docs for the mitsubishi_itp component. Docs are focused on ESPHome use and configuration, and link to a GitHub Pages site for details on hardware installation and compatible devices (as that information is more likely to change frequently).

**Pull request in esphome with YAML changes (if applicable): esphome/esphome#7289

Checklist:

• [x] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [x] Link added in /index.rst when creating new documents for new components or cookbook.

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[nagyrobi]

The parts of the documentation referring to selects and sensors needs some clarification, and formatting according to ESPHome docs.

If I understand well (not sure, please clarify!) it should be something like:

- **selects** (*Optional*): Custom configuration for any of the ``select`` components used by this device:
  - **temperature_source_select**: Choice of the temperature source:
      - All generic options from :ref:`Select <config-select>`.
  - **vane_position_select**: ???
      - All generic options from :ref:`Select <config-select>`.
  - **horizontal_vane_position_select**: ???
      - All generic options from :ref:`Select <config-select>`.
- **sensors** (*Optional*): Custom configuration for any of the sensors provided by this device. These sensors are disabled by default in Home Assistant but can be enabled if desired:
  - **thermostat_temperature**: If a thermostat is connected, reports the last temperature received from the thermostat:
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **compressor_frequency**: Frequency in Hz reported by a variable speed compressor. (Not supported on all types):
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **outdoor_temperature**: Temperature reported by outdoor unit (On supported equipment, may be overloaded on some models):
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **actual_fan**: The actual speed the fan is running at (may differ from set-speed once set-point has been reached or during preheating):
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **service_filter**: Reports if filter needs to be replaced:
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **defrost**: Reports if system is in defrost:
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **preheat**: Reports if system is preheating:
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **standby**: Reports if system is in standby:
      - All generic options from :ref:`Sensor <config-sensor>`.
  - **error_code**: Reports error codes (if any):
      - All generic options from :ref:`Sensor <config-sensor>`.

[Sammy1Am]

Thank you for that suggestion, what you have provided is much clearer than what I had initially-- I'll get this implemented the next chance I get.

[nagyrobi]

I can give you a hand if you enable "Allow edits by maintainers" option on the PR.

[Sammy1Am]

Thank you again for your help, @nagyrobi . The feedback on the main PR changed the config structure significantly; notably the sensors, etc. are now in the sensor section of the configuration and so should be a little more familiar. Would appreciate your feedback on the updated preview if you have a moment.

[nagyrobi]

**Pull request in esphome with YAML changes (if applicable): esphome/esphome#6794

Wrong parent PR!