move examples to main repo so we can include_str them for publishing (#993)

* move exampels to main repo so we can include_str them for publishing

* update CI to not break examples

subxt/examples/storage_iterating.rs

@@ -0,0 +1,29 @@
+use subxt::{OnlineClient, PolkadotConfig};
+
+#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_full.scale")]
+pub mod polkadot {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a new API client, configured to talk to Polkadot nodes.
+    let api = OnlineClient::<PolkadotConfig>::new().await?;
+
+    // Build a storage query to iterate over account information.
+    let storage_query = polkadot::storage().system().account_root();
+
+    // Get back an iterator of results (here, we are fetching 10 items at
+    // a time from the node, but we always iterate over oen at a time).
+    let mut results = api
+        .storage()
+        .at_latest()
+        .await?
+        .iter(storage_query, 10)
+        .await?;
+
+    while let Some((key, value)) = results.next().await? {
+        println!("Key: 0x{}", hex::encode(&key));
+        println!("Value: {:?}", value);
+    }
+
+    Ok(())
+}