feat(x/gov): add MsgSubmitProposal SetMsgs method (backport cosmos#17387) (cosmos#17388)

Co-authored-by: Julien Robert <[email protected]>

Author: 2 people

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (x/gov) [#17387](https://github.com/cosmos/cosmos-sdk/pull/17387) Add `MsgSubmitProposal` `SetMsgs` method. 
 * (x/gov) [#17354](https://github.com/cosmos/cosmos-sdk/issues/17354) Emit `VoterAddr` in `proposal_vote` event.
 * (x/genutil) [#17296](https://github.com/cosmos/cosmos-sdk/pull/17296) Add `MigrateHandler` to allow reuse migrate genesis related function.
     * In v0.46, v0.47 this function is additive to the `genesis migrate` command. However in v0.50+, adding custom migrations to the `genesis migrate` command is directly possible.