add blob example from beacon APIs

.gitignore

@@ -10,3 +10,5 @@ Cargo.lock
 **/*.rs.bk
 
 consensus-spec-tests
+
+.env

beacon-api-client/Cargo.toml

@@ -24,3 +24,6 @@ itertools = "0.10.3"
 clap = { version = "4.3.11", features = ["derive"], optional = true }
 thiserror = "1.0.30"
 ethereum-consensus = { path = "../ethereum-consensus" }
+
+[dev-dependencies]
+dotenv = "0.15.0"

beacon-api-client/examples/blob_sketch.rs

@@ -0,0 +1,23 @@
+use beacon_api_client::{mainnet::Client, BlockId};
+use url::Url;
+
+#[tokio::main]
+async fn main() {
+    let username = dotenv::var("NODE_USERNAME").unwrap();
+    let password = dotenv::var("NODE_PASSWORD").unwrap();
+    let devnet_name = "dencun-devnet-8";
+    let cl = "teku";
+    let el = "geth";
+
+    let url_str =
+        format!("https://{username}:{password}@bn.{cl}-{el}-1.srv.{devnet_name}.ethpandaops.io",);
+
+    let url = Url::parse(&url_str).unwrap();
+    let client = Client::new(url);
+
+    let id = BlockId::Slot(194496);
+    let indices = [];
+
+    let blobs = client.get_blob_sidecars(id, &indices).await.unwrap();
+    dbg!(blobs);
+}