revert: Remove SIGN_MODE_AMINO_AUX (#10322)

<!--
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

Revert #10268 

As part of the TX working group, we decided not to introduce a new sign mode for tipper signing. The tipper will use amino-json to sign via ledger (see #10346).

Also, add `signing.SignerData#Address` (will be used in subsequent PR #10346)

<!-- 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...

- [ ] 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

*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)

docs/core/proto-docs.md

@@ -1279,7 +1279,7 @@ GrantAuthorization defines the GenesisState/GrantAuthorization type.
 <a name="cosmos.authz.v1beta1.QueryGranterGrantsRequest"></a>
 
 ### QueryGranterGrantsRequest
-QueryGranterGrantsRequest is the request type for the Query/Grants RPC method.
+QueryGranterGrantsRequest is the request type for the Query/GranterGrants RPC method.
 
 
 | Field | Type | Label | Description |
@@ -9400,7 +9400,6 @@ SignMode represents a signing mode with its own security guarantees.
 | SIGN_MODE_DIRECT | 1 | SIGN_MODE_DIRECT specifies a signing mode which uses SignDoc and is verified with raw bytes from Tx. |
 | SIGN_MODE_TEXTUAL | 2 | SIGN_MODE_TEXTUAL is a future signing mode that will verify some human-readable textual representation on top of the binary representation from SIGN_MODE_DIRECT. It is currently not supported. |
 | SIGN_MODE_DIRECT_AUX | 3 | SIGN_MODE_DIRECT_AUX specifies a signing mode which uses SignDocDirectAux. As opposed to SIGN_MODE_DIRECT, this sign mode does not require signers signing over other signers' `signer_info`. It also allows for adding Tips in transactions. |
-| SIGN_MODE_AMINO_AUX | 4 | SIGN_MODE_AMINO_AUX specifies a signing mode which uses SignDocAminoAux. |
 | SIGN_MODE_LEGACY_AMINO_JSON | 127 | SIGN_MODE_LEGACY_AMINO_JSON is a backwards compatibility mode which uses Amino JSON and will be removed in the future. |