feat: Add tx encode and decode endpoints for amino txs (#13882)

* add proto changes

* make proto-gen

* wip: adds tests

* wip: tests

* remove consoles

* wip: fix something

* fix: encode amino tests

* add decode amino tests

* wip: address requested changes

* update proto inline docs

* address review comments

Co-authored-by: Amaury M <1293565+amaurym@users.noreply.github.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>
Co-authored-by: atheeshp <59333759+atheeshp@users.noreply.github.com>
(cherry picked from commit e260fc1)

CHANGELOG.md

@@ -69,10 +69,13 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* [13882] (https://github.com/cosmos/cosmos-sdk/pull/13882) Add tx `encode` and `decode` endpoints to amino tx service.
+  > Note: These endpoints encodes and decodes only amino txs.
 * (config) [#13894](https://github.com/cosmos/cosmos-sdk/pull/13894) Support state streaming configuration in `app.toml` template and default configuration.
 * (x/nft) [#13836](https://github.com/cosmos/cosmos-sdk/pull/13836) Remove the validation for `classID` and `nftID` from the NFT module.
 * [#13789](https://github.com/cosmos/cosmos-sdk/pull/13789) Add tx `encode` and `decode` endpoints to tx service.
-  > Note: This endpoint will only encode proto messages, Amino encoding is not supported.
+  > Note: These endpoints will only encode and decode proto messages, Amino encoding and decoding is not supported.
+* [#13826](https://github.com/cosmos/cosmos-sdk/pull/13826) Support custom `GasConfig` configuration for applications.
 * [#13619](https://github.com/cosmos/cosmos-sdk/pull/13619) Add new function called LogDeferred to report errors in defers. Use the function in x/bank files.
 * (tools) [#13603](https://github.com/cosmos/cosmos-sdk/pull/13603) Rename cosmovisor package name to `cosmossdk.io/tools/cosmovisor`. The new tool directory contains Cosmos SDK tools.
 * (deps) [#13397](https://github.com/cosmos/cosmos-sdk/pull/13397) Bump Go version minimum requirement to `1.19`.