chain: Remove the ethereum network indexer

It is essentially dead code, and just gets in the way of various other code
changes

Author: lutter

chain/ethereum/src/lib.rs

@@ -3,7 +3,6 @@ mod capabilities;
 pub mod codec;
 mod data_source;
 mod ethereum_adapter;
-pub mod network_indexer;
 pub mod runtime;
 mod transport;