evm: fixed commented out simulations, pubsub, and handler tests (#655)

* evm: fixed commented out simulations, pubsub, and handler tests

fixes #640

simulations are very basic: they can be built and executed,
but they don't generate any EVM-related transactions yet.
(It should be a matter of adding simulation-related code to the
modules + potentially extra helpers to the simulation.)
handler tests miss some extra assertions due to changes
in the return values snapshotting logic (ADR-001 and ADR-002).

Besides the test suites identified in the audit,
there's also "importer_test.go" which wasn't yet fixed.
(it'd require major rewriting + extra test resources)

* gofumpt

app/app.go

@@ -495,6 +495,8 @@ func NewEthermintApp(
 		authzmodule.NewAppModule(appCodec, app.AuthzKeeper, app.AccountKeeper, app.BankKeeper, app.interfaceRegistry),
 		ibc.NewAppModule(app.IBCKeeper),
 		transferModule,
+		evm.NewAppModule(app.EvmKeeper, app.AccountKeeper),
+		feemarket.NewAppModule(app.FeeMarketKeeper),
 	)
 
 	app.sm.RegisterStoreDecoders()