chore: separated deprecated modules into the contrib directory (#25613)

Co-authored-by: Alex | Cosmos Labs <[email protected]>

Author: mmsqe

CHANGELOG.md

@@ -70,6 +70,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/bank) [#24660](https://github.com/cosmos/cosmos-sdk/pull/24660) Improve performance of the `GetAllBalances` and `GetAccountsBalances` keeper methods.
 * (collections) [#25464](https://github.com/cosmos/cosmos-sdk/pull/25464) Add `IterateRaw` method to `Multi` index type to satisfty query `Collection` interface.
 * (x/mint) [#25562](https://github.com/cosmos/cosmos-sdk/pull/25562) Improve and test `x/mint` params validation.
+* (api) [#25613](https://github.com/cosmos/cosmos-sdk/pull/25613) Separated deprecated modules into the contrib directory, distinct from api, to enable and unblock new proto changes without affecting legacy code.
 
 ### Bug Fixes