Added randomized simulation parameters generation (#389)

* added simulation params

* fixed return types

* implemented full sim test on wasmd

* removed wrong committed github action

* switched to a import export test since i'm introducing params and genesis simulations

* fixed makefile

* Fixed sim test flags not working

* fixed some errors on sim test

* fixed conflicts
still a failure to be solved

* fixed wasm params error

* added missing codec

* Update params.go

removed unused import

* fixed intellij cache errors

* added full app simulation test that pass

* added README.md for sims credits
added me into contributors list

Co-authored-by: riccardo.montagnin <riccardo.montagnin@gmail.com>

x/wasm/module_test.go

@@ -34,8 +34,9 @@ type testData struct {
 // returns a cleanup function, which must be defered on
 func setupTest(t *testing.T) testData {
 	ctx, keepers := CreateTestInput(t, false, "staking,stargate", nil, nil)
+	cdc := keeper.MakeTestCodec(t)
 	data := testData{
-		module:        NewAppModule(keepers.WasmKeeper, keepers.StakingKeeper),
+		module:        NewAppModule(cdc, keepers.WasmKeeper, keepers.StakingKeeper),
 		ctx:           ctx,
 		acctKeeper:    keepers.AccountKeeper,
 		keeper:        *keepers.WasmKeeper,