feat(staking): migrate x/params away from x/staking

CHANGELOG.md

@@ -59,6 +59,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/mint) [#12363](https://github.com/cosmos/cosmos-sdk/pull/12363) Migrate `x/mint` to self-managed parameters and deprecate it's usage of `x/params`.
 * (x/distribution) [#12434](https://github.com/cosmos/cosmos-sdk/pull/12434) Migrate `x/distribution` to self-managed parameters and deprecate it's usage of `x/params`.
 * (x/crisis) [#12445](https://github.com/cosmos/cosmos-sdk/pull/12445) Migrate `x/crisis` to self-managed parameters and deprecate it's usage of `x/params`.
+* (x/staking) [#12409](https://github.com/cosmos/cosmos-sdk/pull/12409) Migrate `x/staking` to self-managed parameters and deprecate it's usage of `x/params`.
+
 
 ### API Breaking Changes
 
@@ -74,6 +76,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/staking) [#12102](https://github.com/cosmos/cosmos-sdk/pull/12102) Staking keeper now is passed by reference instead of copy. Keeper's SetHooks no longer returns keeper. It updates the keeper in place instead.
 * (linting) [#12141](https://github.com/cosmos/cosmos-sdk/pull/12141) Fix usability related linting for database.  This means removing the infix Prefix from `prefix.NewPrefixWriter` and such so that it is `prefix.NewWriter` and making `db.DBConnection` and such into `db.Connection`
 * (x/distribution) [#12434](https://github.com/cosmos/cosmos-sdk/pull/12434) `x/distribution` module `SetParams` keeper method definition is now updated to return `error`.
+* (x/staking) [#12409](https://github.com/cosmos/cosmos-sdk/pull/12409) `x/staking` module `SetParams` keeper method definition is now updated to return `error`.
 * (x/crisis) [#12445](https://github.com/cosmos/cosmos-sdk/pull/12445) `x/crisis` module `SetConstantFee` keeper method definition is now updated to return `error`.
 
 ### CLI Breaking Changes