fix: return ethereum-formatted tx hash to client (#202)

* return eth tx hash to client

Closes #67

Update ethereum/rpc/namespaces/eth/api.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

Update ethereum/rpc/namespaces/eth/api.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

change GetTxByEthHash to method

add entry to changelog

* use eth tx hash internally

app/app.go

@@ -247,14 +247,13 @@ func NewEthermintApp(
 	appCodec := encodingConfig.Marshaler
 	cdc := encodingConfig.Amino
 	interfaceRegistry := encodingConfig.InterfaceRegistry
-	txDecoder := encodingConfig.TxConfig.TxDecoder()
 
 	// NOTE we use custom transaction decoder that supports the sdk.Tx interface instead of sdk.StdTx
 	bApp := baseapp.NewBaseApp(
 		appName,
 		logger,
 		db,
-		txDecoder,
+		encodingConfig.TxConfig.TxDecoder(),
 		baseAppOptions...,
 	)
 	bApp.SetCommitMultiStoreTracer(traceStore)
@@ -337,7 +336,7 @@ func NewEthermintApp(
 
 	// Create Ethermint keepers
 	app.EvmKeeper = evmkeeper.NewKeeper(
-		appCodec, txDecoder, keys[evmtypes.StoreKey], tkeys[evmtypes.TransientKey], app.GetSubspace(evmtypes.ModuleName),
+		appCodec, keys[evmtypes.StoreKey], tkeys[evmtypes.TransientKey], app.GetSubspace(evmtypes.ModuleName),
 		app.AccountKeeper, app.BankKeeper, app.StakingKeeper,
 		bApp.Trace(), // debug EVM based on Baseapp options
 	)