Huawei: add curtailment api

[CiNcH83]

[Depends on #28538]

Open Questions

• It would also be possible to set the mode programmatically via register 47415, see here. But it is kind of redundant to do it on every call!?

[sourcery-ai]

Hey - I've left some high level feedback:

• In curtailMeter.Curtailed, you return val < m.nominalLimit even when curtailedG returns an error; consider short‑circuiting and returning false, err on error to avoid exposing a potentially misleading curtailed state when the underlying read failed.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `curtailMeter.Curtailed`, you return `val < m.nominalLimit` even when `curtailedG` returns an error; consider short‑circuiting and returning `false, err` on error to avoid exposing a potentially misleading curtailed state when the underlying read failed.

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