fix(license): Add license headers

Author: neithanmo

rav_e2e/src/main.rs

@@ -1,3 +1,6 @@
+// Copyright 2023-, Edge & Node, GraphOps, and Semiotic Labs.
+// SPDX-License-Identifier: Apache-2.0
+
 use anyhow::Result;
 use reqwest::Client;
 use serde_json::json;

rav_e2e/src/metrics.rs

@@ -1,3 +1,6 @@
+// Copyright 2023-, Edge & Node, GraphOps, and Semiotic Labs.
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{collections::HashMap, sync::Arc};
 
 use anyhow::Result;

rav_e2e/src/receipt.rs

@@ -1,3 +1,6 @@
+// Copyright 2023-, Edge & Node, GraphOps, and Semiotic Labs.
+// SPDX-License-Identifier: Apache-2.0
+
 use rand::Rng;
 use std::str::FromStr;
 use std::time::SystemTime;