[FEA] Support `LazyFrame.rolling()` for streaming cuDF-Polars

We want `LazyFrame.rolling(...)` supported for streaming execution with the rapidsmpf runtime. Today Rolling IR falls back to single-partition execution, which is correct but not scalable.

## Scope

1. **Single-rank**: Implement a rolling actor path for `LazyFrame.rolling(...)`.
2. **Multi-rank**: Explicitly depend on a HaloExchange API in RapidsMPF (E.g. https://github.com/rapidsai/rapidsmpf/pull/947)