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_fetch_dynamic.rs

@@ -0,0 +1,27 @@
+use sp_keyring::AccountKeyring;
+use subxt::dynamic::{At, Value};
+use subxt::{OnlineClient, PolkadotConfig};
+
+#[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 dynamic storage query to access account information.
+    let account = AccountKeyring::Alice.to_account_id();
+    let storage_query =
+        subxt::dynamic::storage("System", "Account", vec![Value::from_bytes(account)]);
+
+    // Use that query to `fetch` a result. Because the query is dynamic, we don't know what the result
+    // type will be either, and so we get a type back that can be decoded into a dynamic Value type.
+    let result = api
+        .storage()
+        .at_latest()
+        .await?
+        .fetch(&storage_query)
+        .await?;
+    let value = result.unwrap().to_value()?;
+
+    println!("Alice has free balance: {:?}", value.at("data").at("free"));
+    Ok(())
+}