Support downloading account statements

As described in the examples/download_statement.rs file.

Signed-off-by: Jacob Kiers <code@kiers.eu>

examples/download_statement.rs

@@ -0,0 +1,35 @@
+use anyhow::Result;
+use bunq::{BunqConfig, CsvType, StatementFormat};
+use std::time::Duration;
+
+fn main() -> Result<()> {
+    let cfg = BunqConfig::load()?;
+
+    let client = cfg.install()?;
+
+    let accs = client.monetary_accounts()?;
+
+    let acc = &accs[0];
+
+    let stmt_id = client.request_statement(
+        acc,
+        StatementFormat::CSV(CsvType::Semicolon),
+        "2023-12-05",
+        "2023-12-15",
+    )?;
+
+    println!("Waiting for statement {:?}...", stmt_id);
+
+    let mut ready = client.is_statement_ready(acc, stmt_id)?;
+    while !ready {
+        println!("Statement is not ready yet. Waiting 5 seconds...");
+        std::thread::sleep(Duration::from_secs(5));
+        ready = client.is_statement_ready(acc, stmt_id)?;
+    }
+
+    let contents = client.download_statement(acc, stmt_id)?;
+
+    println!("{contents}");
+
+    Ok(())
+}