Function ingest_csv_from_path 

pub fn ingest_csv_from_path(
    path: impl AsRef<Path>,
    schema: &Schema,
) -> IngestionResult<DataSet>

Ingest a CSV file into an in-memory DataSet.

Rules:

• CSV must have headers.
• Headers must contain all schema fields (order can differ).
• Each value is parsed according to the schema field type.