fix(balancer): miscellaneous improvements before resync (#104)

* fix(balancer): ignore self balance change

Euler pool emit a balance change for the pool itself. We don't want to have it because it's an unknown token from Tycho's perspective.

example: https://etherscan.io/tx/0x4a9ea683052afefdae3d189862868c3a7dc8f431d1d9828b6bfd9451a8816426#eventlog#338

* refactor(balancer): rename balancer module to balancer-v2

* ci: make clippy happy

---------

Co-authored-by: zizou <111426680+flopell@users.noreply.github.com>

substreams/ethereum-balancer-v2/build.rs

@@ -0,0 +1,44 @@
+use anyhow::Result;
+use std::{fs, io::Write};
+use substreams_ethereum::Abigen;
+
+fn main() -> Result<()> {
+    let abi_folder = "abi";
+    let output_folder = "src/abi";
+
+    let files = fs::read_dir(abi_folder)?;
+    let mut mod_rs_content = String::new();
+    mod_rs_content.push_str("#![allow(clippy::all)]\n");
+
+    for file in files {
+        let file = file?;
+        let file_name = file.file_name();
+        let file_name = file_name.to_string_lossy();
+
+        if !file_name.ends_with(".json") {
+            continue;
+        }
+
+        let contract_name = file_name.split('.').next().unwrap();
+
+        let input_path = format!("{}/{}", abi_folder, file_name);
+        let output_path = format!("{}/{}.rs", output_folder, contract_name);
+
+        mod_rs_content.push_str(&format!("pub mod {};\n", contract_name));
+
+        if std::path::Path::new(&output_path).exists() {
+            continue;
+        }
+
+        Abigen::new(contract_name, &input_path)?
+            .generate()?
+            .write_to_file(&output_path)?;
+    }
+
+    let mod_rs_path = format!("{}/mod.rs", output_folder);
+    let mut mod_rs_file = fs::File::create(mod_rs_path)?;
+
+    mod_rs_file.write_all(mod_rs_content.as_bytes())?;
+
+    Ok(())
+}