Update ethereum-template

Remove unecessary pb module, import models from tycho-substreams instead.

Integrate package directly into workspace.

substreams/ethereum-template/src/modules.rs

@@ -0,0 +1,12 @@
+use std::collections::HashMap;
+use substreams_ethereum::pb::eth;
+use tycho_substreams::prelude::*;
+
+#[substreams::handlers::map]
+fn map_protocol_changes(
+    block: eth::v2::Block,
+) -> Result<BlockContractChanges, substreams::errors::Error> {
+    let mut transaction_contract_changes = Vec::<TransactionContractChanges>::new();
+    // TODO: protocol specific logic goes here
+    Ok(BlockContractChanges { block: Some((&block).into()), changes: transaction_contract_changes })
+}