Add Z-wave climate sensor override for Heatit Z-TRM6

[geirra]

Proposed change

This PR adds support for the z-trm6 z-wave thermostat.
The thermostat supports multiple operation modes and as such it supports 3 temp sensors depending on the config, the pr swaps the climate entity to support show the correct sensor.

Type of change

• New feature (which adds functionality to an existing integration)

Additional information

The code is done in the same style as z-trm3 + 2, but a better approch might be to don't rely on the template names (that could be changed upstream) and rather the integer value of the config param.
See comment here: zwave-js/node-zwave-js#6464 (review)

But this PR is made in the style of the previous code changes.

Checklist

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• Tests have been added to verify that the new code works.

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[home-assistant]

Hey there @home-assistant/z-wave, mind taking a look at this pull request as it has been labeled with an integration (zwave_js) you are listed as a code owner for? Thanks!

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[home-assistant]

Hi @geirra

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[MartinHjelmare]

Thanks!

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