Huawei SUN2000: support import/export for grid/battery

[CiNcH83]

Depends on #29805.

Notes:
Huawei does not provide self-consumption information.

Open Questions:

• what is import/export for the inverter (pv)? Is production export? Or do we leave it at energy?

[sourcery-ai]

Hey - I've left some high level feedback:

• Renaming the existing energy fields to import/export changes the metric contract; consider either keeping a backward-compatible energy alias or explicitly handling the migration for existing consumers of this template.
• The import register for the battery meter uses two separate if blocks for storageunit 1 and 2; if another value is passed, no address is set, so it may be safer to add an else/default branch or validation to avoid generating an invalid configuration.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Renaming the existing `energy` fields to `import`/`export` changes the metric contract; consider either keeping a backward-compatible `energy` alias or explicitly handling the migration for existing consumers of this template.
- The `import` register for the battery meter uses two separate `if` blocks for `storageunit` 1 and 2; if another value is passed, no address is set, so it may be safer to add an `else`/default branch or validation to avoid generating an invalid configuration.

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[CiNcH83]

@andig Think we are missing #29805.