[FEA] Generate docs description of cudf-polars engine options from code

**Is your feature request related to a problem? Please describe.**

cudf-polars has many options for the streaming engine, enumerated in cudf_polars/streaming/options.py (or similar). These all come with defaults and descriptions.

These defaults and descriptions are replicated at least twice: once in the code, and then again in a table in the documentation.

This is bad, because the two can go out of sync with one-another.

**Describe the solution you'd like**

We should generate the documentation table from the canonical options file.

**Describe alternatives you've considered**

Maintain both by hand and hope reviews catch mismatches.

Start with cudf_polars/streaming/options.py, or the corresponding options module, and locate the documentation table that repeats its streaming engine defaults and descriptions. Trace how the documentation is built, then make the table derive from the canonical options definitions and verify that generated entries match the code.

Written by the indexing model from the issue text.