Add Xtherma heatpump (experimental)

[andig]

Fix #26409

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `templates/definition/charger/xtherma.yaml:12-14` </location>
<code_context>
+params:
+  - name: modbus
+    choice: ["tcpip"]
+  - name: tempsource
+    type: choice
+    choice: ["warmwater", "buffer"]
+render: |
+  type: heatpump
</code_context>

<issue_to_address>
**issue:** The `tempsource` parameter is defined but not used in the rendered config.

Since changing `tempsource` currently has no effect, either wire it into the template logic (e.g., conditionally select different `temp`/`limittemp` registers or scaling based on its value) or remove it until it’s actually used to avoid confusing users.
</issue_to_address>

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[55Jojo2024]

I haven't had a chance to properly test this yet, the sun isnt shining, but these are my findings so far.

[55Jojo2024]

I believe this should be templimit instead.

[andig]

Are you guessing or did you actually test this? See https://github.com/evcc-io/evcc/blob/master/charger/measurement/heating.go#L10

[andig]

ping @55Jojo2024 did you test this?