Fix #39

[ddnomad]

Implemented changes proposed in #39. Please note that this change breaks compatibility with previous version by removing (now redundant) content_length, content_type and url fields here:

icann-rdap/icann-rdap-client/src/lib.rs

Lines 33 to 35 in 8b8478c

	pub content_length: Option<u64>,
	pub content_type: Option<String>,
	pub url: Url,

Removed fields should now be accessible as part of a new http_data field on icann_rdap_client::RdapClientError::ParsingError error variant (content_length, content_type and host fields respectively).

Minimal reproducible example of a (now supported) use case:

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let client_config = icann_rdap_common::client::ClientConfig::builder()
        .https_only(false)
        .follow_redirects(false)
        .build();
    
    let client = icann_rdap_common::client::create_client(&client_config)
        .expect("Failed to build RDAP library client");
    
    let query = icann_rdap_client::query::qtype::QueryType::from_str("10.0.0.0/8")?;

    // Will result in `icann_rdap_client::RdapClientError::ParsingError` because of
    // `follow_redirects(false)` in `client_config`
    let error = icann_rdap_client::query::request::rdap_request(
        "http://127.0.0.1/rdapbootstrap", // Locally running RDAP bootstrap server
        &query,
        client
    )
    .await
    .unwrap_err(); // PR adds `Debug` derive on `icann_rdap_client::query::request::ResponseData`

    match error {
	icann_rdap_client::RdapClientError::ParsingError(info) => {
		println!(
			"Should now send a request to: {}",
			info.http_data.location.expect("No location, strange!")
		)
	}
	_ => panic!("Something went wrong!"),
    }
}

Do let me know if any issues.