feat(rust): added gcs to gcp cloud schema in polars-core::cloud #10206.

[varunmittal91]

Closes #10206

Added gcs to cloud options parser.

        Ok(match parsed.scheme() {
            "s3" => Self::Aws,
            "az" | "adl" | "abfs" => Self::Azure,
            "gs" | "gcp" | "gcs" => Self::Gcp,
            "file" => Self::File,
            _ => polars_bail!(ComputeError: "unknown url scheme"),
        })

This does not fail on passing gcs as the schema and allows ParquetReader to treat it as a cloud option.

[ritchie46]

Thanks!