Add missing DataFrame methods (set operations and query)

[timsaucer]

Summary

Several DataFrame methods from upstream DataFusion v53 are not yet exposed in datafusion-python. This issue covers set operations and query-related methods.

Missing Methods

Set operations:

• distinct_on — deduplicate rows based on specific columns, keeping the first row per group
• except_distinct — set difference with deduplication (complement to existing except_all)
• intersect_distinct — set intersection with deduplication (complement to existing intersect)
• union_by_name — union two DataFrames matching columns by name rather than position
• union_by_name_distinct — union by name with deduplication

Query/display:

• explain_with_options — explain plan with configurable detail options
• show_limit — display results with a custom row limit
• sort_by — sort by column names (simpler API than sort which requires Expr)
• with_param_values — bind parameter values for prepared statements

Upstream Reference

• https://docs.rs/datafusion/53.0.0/datafusion/dataframe/struct.DataFrame.html

Implementation

• Rust bindings: crates/core/src/dataframe.rs
• Python wrappers: python/datafusion/dataframe.py

Note: This gap analysis was performed using an AI agent comparing upstream DataFusion v53 documentation against the current datafusion-python codebase.