minor: add builder setting NdJsonReadOptions::schema_infer_max_records

[Jefffrey]

Noticed this was missing, meaning would have to do something awkward like:

    ctx.read_json(
        "/Users/jeffrey/Downloads/a.json",
        NdJsonReadOptions {
            schema_infer_max_records: 2,
            ..Default::default()
        },
    )
    .await?
    .show()
    .await?;

Add this builder method to be consistent with the other options and be more ergonomic to use.

[alamb]

👍 thanks @Jefffrey