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/blocks_subscribing.rs

@@ -0,0 +1,56 @@
+use futures::StreamExt;
+use subxt::{OnlineClient, PolkadotConfig};
+
+#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
+pub mod polkadot {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a client to use:
+    let api = OnlineClient::<PolkadotConfig>::new().await?;
+
+    // Subscribe to all finalized blocks:
+    let mut blocks_sub = api.blocks().subscribe_finalized().await?;
+
+    // For each block, print a bunch of information about it:
+    while let Some(block) = blocks_sub.next().await {
+        let block = block?;
+
+        let block_number = block.header().number;
+        let block_hash = block.hash();
+
+        println!("Block #{block_number}:");
+        println!("  Hash: {block_hash}");
+        println!("  Extrinsics:");
+
+        // Log each of the extrinsic with it's associated events:
+        let body = block.body().await?;
+        for ext in body.extrinsics().iter() {
+            let ext = ext?;
+            let idx = ext.index();
+            let events = ext.events().await?;
+            let bytes_hex = format!("0x{}", hex::encode(ext.bytes()));
+
+            // See the API docs for more ways to decode extrinsics:
+            let decoded_ext = ext.as_root_extrinsic::<polkadot::Call>();
+
+            println!("    Extrinsic #{idx}:");
+            println!("      Bytes: {bytes_hex}");
+            println!("      Decoded: {decoded_ext:?}");
+            println!("      Events:");
+
+            for evt in events.iter() {
+                let evt = evt?;
+
+                let pallet_name = evt.pallet_name();
+                let event_name = evt.variant_name();
+                let event_values = evt.field_values()?;
+
+                println!("        {pallet_name}_{event_name}");
+                println!("          {}", event_values);
+            }
+        }
+    }
+
+    Ok(())
+}