refactor: Revert middlewares to antehandler (part 2/2: posthandler) (c…

…osmos#11985)

## Description

We decided to remove middlewares, and revert to antehandlers (exactly like in v045) for this release. A better middleware solution will be implemented after v046.

ref: cosmos#11955

This PR is part 2 of 2:

- part 1: Revert baseapp and middlewares to v0.45.4
- part 2: Add posthandler, tips, priority

Depends on:
- [x] cosmos#11979 

---

Suggestion for reviewers:

- Apart from correctness, I would also like someone to review **exhaustiveness**. I.e. all changes we made in v046 into the [middleware folder](https://github.com/cosmos/cosmos-sdk/tree/v0.46.0-beta2/x/auth/middleware) are reflected in this PR, and that I didn't forget anything. I found the following ones:
  - add a TxFeeChecker in DeductFee
  - add a ExtensionChecker in ExtCheckerDecorator
  - add a TipDecorator



---

### 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...

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

app.go

@@ -34,6 +34,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/auth/ante"
 	authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
+	"github.com/cosmos/cosmos-sdk/x/auth/posthandler"
 	authsims "github.com/cosmos/cosmos-sdk/x/auth/simulation"
 	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
@@ -443,6 +444,27 @@ func NewSimApp(
 	app.SetBeginBlocker(app.BeginBlocker)
 	app.SetEndBlocker(app.EndBlocker)
 	app.setAnteHandler(encodingConfig.TxConfig, cast.ToStringSlice(appOpts.Get(server.FlagIndexEvents)))
+	// In v0.46, the SDK introduces _postHandlers_. PostHandlers are like
+	// antehandlers, but are run _after_ the `runMsgs` execution. They are also
+	// defined as a chain, and have the same signature as antehandlers.
+	//
+	// In baseapp, postHandlers are run in the same store branch as `runMsgs`,
+	// meaning that both `runMsgs` and `postHandler` state will be committed if
+	// both are successful, and both will be reverted if any of the two fails.
+	//
+	// The SDK exposes a default postHandlers chain, which comprises of only
+	// one decorator: the Transaction Tips decorator. However, some chains do
+	// not need it by default, so the following line is commented out. You can
+	// uncomment it to include the tips decorator, or define your own
+	// postHandler chain. To read more about tips:
+	// https://docs.cosmos.network/main/core/tips.html
+	//
+	// Please note that changing any of the anteHandler or postHandler chain is
+	// likely to be a state-machine breaking change, which needs a coordinated
+	// upgrade.
+	//
+	// Uncomment to enable postHandlers:
+	// app.setPostHandler()
 
 	if loadLatest {
 		if err := app.LoadLatestVersion(); err != nil {
@@ -475,6 +497,19 @@ func (app *SimApp) setAnteHandler(txConfig client.TxConfig, indexEventsStr []str
 	app.SetAnteHandler(anteHandler)
 }
 
+func (app *SimApp) setPostHandler() {
+	postHandler, err := posthandler.NewPostHandler(
+		posthandler.HandlerOptions{
+			BankKeeper: app.BankKeeper,
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	app.SetPostHandler(postHandler)
+}
+
 // Name returns the name of the App
 func (app *SimApp) Name() string { return app.BaseApp.Name() }