feat(substreams): add substreams for Uniswap v2 and v3

substreams/ethereum-uniswap-v3/build.rs

@@ -0,0 +1,12 @@
+use anyhow::{Ok, Result};
+use substreams_ethereum::Abigen;
+
+fn main() -> Result<(), anyhow::Error> {
+    Abigen::new("Factory", "abi/Factory.json")?
+        .generate()?
+        .write_to_file("src/abi/factory.rs")?;
+    Abigen::new("Pool", "abi/Pool.json")?
+        .generate()?
+        .write_to_file("src/abi/pool.rs")?;
+    Ok(())
+}