feat: fee market module (#491)

* feat: fee market module

* update proto

* queriers: CLI + gRPC

* gov params

* genesis

* enable height

* fixes

* fix app

x/feemarket/keeper/params.go

@@ -0,0 +1,18 @@
+package keeper
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
+	"github.com/tharsis/ethermint/x/feemarket/types"
+)
+
+// GetParams returns the total set of fee market parameters.
+func (k Keeper) GetParams(ctx sdk.Context) (params types.Params) {
+	k.paramSpace.GetParamSet(ctx, &params)
+	return params
+}
+
+// SetParams sets the fee market parameters to the param space.
+func (k Keeper) SetParams(ctx sdk.Context, params types.Params) {
+	k.paramSpace.SetParamSet(ctx, &params)
+}