feemarket: change basefee to be a module param (#943)

* change basefee to a module params

* add changelog and fix linter

* change params type of basefee and remove default base fee

* restaure event

* clean code

* fix proto

* fix protos

* fix logic

* update rpc tests

* fix comment

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

proto/ethermint/feemarket/v1/feemarket.proto

@@ -1,6 +1,8 @@
 syntax = "proto3";
 package ethermint.feemarket.v1;
 
+import "gogoproto/gogo.proto";
+
 option go_package = "github.com/tharsis/ethermint/x/feemarket/types";
 
 // Params defines the EVM module parameters
@@ -13,8 +15,14 @@ message Params {
   // elasticity multiplier bounds the maximum gas limit an EIP-1559 block may
   // have.
   uint32 elasticity_multiplier = 3;
-  // initial base fee for EIP-1559 blocks.
-  int64 initial_base_fee = 4;
+  // DEPRECATED: initial base fee for EIP-1559 blocks.
+  reserved  4;
+  reserved "initial_base_fee";
   // height at which the base fee calculation is enabled.
   int64 enable_height = 5;
+  // base fee for EIP-1559 blocks.
+  string base_fee = 6 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
+    (gogoproto.nullable) = false
+  ];
 }

proto/ethermint/feemarket/v1/genesis.proto

@@ -10,12 +10,10 @@ option go_package = "github.com/tharsis/ethermint/x/feemarket/types";
 message GenesisState {
   // params defines all the paramaters of the module.
   Params params = 1 [ (gogoproto.nullable) = false ];
-  // base fee is the exported value from previous software version.
+  // DEPRECATED: base fee is the exported value from previous software version.
   // Zero by default.
-  string base_fee = 2 [
-    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
-    (gogoproto.nullable) = false
-  ];
+  reserved 2;
+  reserved "base_fee";
   // block gas is the amount of gas used on the last block before the upgrade.
   // Zero by default.
   uint64 block_gas = 3;