`for` grammar: support `else on` and `else for`
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Issue body
We should support `else on` and `else for` statements in `for` grammar.
Example usage:
```yaml
build-packages:
- for raspi:
- on arm64:
- gcc
- else:
- gcc-aarch64-linux-gnu
- else for pc:
- on amd64:
- gcc
- else:
- gcc-x86-64-linux-gnu
```
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