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## Description
Closes: #10484
This PR makes the following big changes:
### 1. Change the tx.Handler interface
```diff
- CheckTx(ctx context.Context, tx sdk.Tx, req abci.RequestCheckTx) (abci.ResponseCheckTx, error)
+ CheckTx(ctx context.Context, req tx.Request, checkReq tx.RequestCheckTx) (tx.Response, tx.ResponseCheckTx, error)
// same for Deliver and Simulate
```
where:
```go
type Response struct {
GasWanted uint64
GasUsed uint64
// MsgResponses is an array containing each Msg service handler's response
// type, packed in an Any. This will get proto-serialized into the `Data` field
// in the ABCI Check/DeliverTx responses.
MsgResponses []*codectypes.Any
Log string
Events []abci.Event
}
```
### 2. Change what gets passed into the ABCI Check/DeliverTx `Data` field
Before, we were passing the concatenation of MsgResponse bytes into the `Data`. Now we are passing the proto-serialiazation of this struct:
```proto
message TxMsgData {
repeated google.protobuf.Any msg_responses = 2;
}
```
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---
### Author Checklist
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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/master/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/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/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
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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)
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