## Description
Closes: #13099
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## Description
Both slashing and distribution simulator is using ugly casting from the nice interface type to:
```go
stakeKeeper := sk.(*stakingkeeper.Keeper)
```
This creates additional dependency for `staking/keeper` package in other modules, and requires type of a specific type (here reference type, in 0.46 it's even worse - because it uses object type).
EXTRA:
* removed `stakingkeepr.RandomValidator` function (which btw, was also weird, because it was in the keeper module and required Keeper as an argument) and created generic `testutil.RandSliceElem` function.
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## Description
Upgrades the math library in the repo root and find/replaces many usages of sdk.Dec, sdk.ZeroDec, sdk.OneDec, sdk.NewDec with their legacy-ified-math-lib replacements.
Note for review: I assume that I did not find 100% of usages
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* mainly sdk.int to cosmossdk.io/math
* staking keys
* fumpt
* var-naming linter errors and a fumpt
* Update CHANGELOG.md
* Update .golangci.yml
* Update CHANGELOG.md
* Update test_helpers.go
* Update test_helpers.go
* fumpt and lint
* this lints the db module, and makes it easier to use. It adds breaking name changes
* DBConnection -> Connection
* previous commit contained a merge error
* Update test_helpers.go
* Update test_helpers.go
* db renamings
* merge master
* changelog
* DBWriter -> Writer
* consistent multistore reciever
* standard recievers for multistore v2alpha1
* general cleanup of linting issues
* more linter fixes
* remove prealloc linter
* nolint the secp256k1 import
* nolint the secp256k1 package
* completenolint resulting in a diff that has only nolints
## Description
Migrate x/staking to the new app wiring (dependency injection).
Tracking progress at https://github.com/cosmos/cosmos-sdk/issues/12036
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## Description
Reverts the usage of a singleton `legacy.Cdc` codec while (de)serializing `x/authz` messages.
Closes: #11643
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## Description
Replaces all the various `ModuleCdc` instances with the global `legacy.Cdc` to properly support Amino serialization for the `x/authz` module. This is needed in order to correctly support Ledger signing for `MsgExec` and messages.
Closes: #11232
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