feat: ethereum-balancer implementation

substreams/ethereum-balancer/abi/README.md

@@ -0,0 +1,9 @@
+# ABIs
+
+`get_abis.py` is a simple python script using the etherscan API (free plan) to gather ABIs for all of the contracts we are tracking!
+
+We then can define all of the abis via `substreams_ethereum::Abigen::new` in our `build.rs`.
+
+## Recommendation
+
+It would be apt to convert (maybe through copilot) the python code into the `build.rs` file and then automate the `Abigen` functionality.