refactor!: Remove clientCtx.JSONCodec and rename EncodingConfig.Marshaler to Codec (#9521)

<!--
The default pull request template is for types feat, fix, or refactor.
For other templates, add one of the following parameters to the url:
- template=docs.md
- template=other.md
-->

## Description

Closes: #9499 

<!-- Add a description of the changes that this PR introduces and the files that
are the most critical to review. -->

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [x] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

simapp/simd/cmd/genaccounts_test.go

@@ -58,7 +58,7 @@ func TestAddGenesisAccountCmd(t *testing.T) {
 			cfg, err := genutiltest.CreateDefaultTendermintConfig(home)
 			require.NoError(t, err)
 
-			appCodec := simapp.MakeTestEncodingConfig().Marshaler
+			appCodec := simapp.MakeTestEncodingConfig().Codec
 			err = genutiltest.ExecInitCmd(testMbm, home, appCodec)
 			require.NoError(t, err)
 

simapp/simd/cmd/root.go

@@ -39,7 +39,7 @@ import (
 func NewRootCmd() (*cobra.Command, params.EncodingConfig) {
 	encodingConfig := simapp.MakeTestEncodingConfig()
 	initClientCtx := client.Context{}.
-		WithCodec(encodingConfig.Marshaler).
+		WithCodec(encodingConfig.Codec).
 		WithInterfaceRegistry(encodingConfig.InterfaceRegistry).
 		WithTxConfig(encodingConfig.TxConfig).
 		WithLegacyAmino(encodingConfig.Amino).
@@ -163,7 +163,7 @@ func initRootCmd(rootCmd *cobra.Command, encodingConfig params.EncodingConfig) {
 	)
 
 	// add rosetta
-	rootCmd.AddCommand(server.RosettaCommand(encodingConfig.InterfaceRegistry, encodingConfig.Marshaler))
+	rootCmd.AddCommand(server.RosettaCommand(encodingConfig.InterfaceRegistry, encodingConfig.Codec))
 }
 
 func addModuleInitFlags(startCmd *cobra.Command) {

simapp/simd/cmd/testnet_test.go

@@ -24,12 +24,12 @@ func Test_TestnetCmd(t *testing.T) {
 	cfg, err := genutiltest.CreateDefaultTendermintConfig(home)
 	require.NoError(t, err)
 
-	err = genutiltest.ExecInitCmd(simapp.ModuleBasics, home, encodingConfig.Marshaler)
+	err = genutiltest.ExecInitCmd(simapp.ModuleBasics, home, encodingConfig.Codec)
 	require.NoError(t, err)
 
 	serverCtx := server.NewContext(viper.New(), cfg, logger)
 	clientCtx := client.Context{}.
-		WithCodec(encodingConfig.Marshaler).
+		WithCodec(encodingConfig.Codec).
 		WithHomeDir(home).
 		WithTxConfig(encodingConfig.TxConfig)
 
@@ -45,6 +45,6 @@ func Test_TestnetCmd(t *testing.T) {
 	appState, _, err := genutiltypes.GenesisStateFromGenFile(genFile)
 	require.NoError(t, err)
 
-	bankGenState := banktypes.GetGenesisStateFromAppState(encodingConfig.Marshaler, appState)
+	bankGenState := banktypes.GetGenesisStateFromAppState(encodingConfig.Codec, appState)
 	require.NotEmpty(t, bankGenState.Supply.String())
 }