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

substreams/ethereum-uniswap-v2/src/lib.rs

@@ -0,0 +1,10 @@
+#![allow(clippy::not_unsafe_ptr_arg_deref)]
+
+mod abi;
+mod modules;
+mod pb;
+
+pub use modules::*;
+
+mod store_key;
+mod traits;