Support `collect_set` and `collect_set` for windows execution

[comphead]

Is your feature request related to a problem or challenge?

Summary

Support collect_list and collect_set as window functions in DataFusion.

These are commonly used in Spark and other query engines to collect values within a window frame and enable use cases such as rolling lists, session analysis, and sequence-based analytics.

Example

SELECT
    user_id,
    ts,
    collect_list(event) OVER (
        PARTITION BY user_id
        ORDER BY ts
        ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
    ) AS events
FROM t;

SELECT
    user_id,
    ts,
    collect_set(event) OVER (
        PARTITION BY user_id
        ORDER BY ts
        ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
    ) AS unique_events
FROM t;

Motivation

Supporting these functions would improve Spark compatibility and align DataFusion with other query engines that support aggregate window functions, including DuckDB (list), Trino/Presto (array_agg), PostgreSQL (array_agg), BigQuery (ARRAY_AGG), and Snowflake.

Acceptance Criteria

• Support collect_list(...) OVER (...)
• Support collect_set(...) OVER (...)
• Support standard window frames (ROWS and RANGE) where applicable
• Add SQL and DataFrame tests covering common window specifications

Describe the solution you'd like

No response

Describe alternatives you've considered

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Additional context

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