* 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
Closes: #11378
---
### Author Checklist
*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*
I have...
- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
### Reviewers Checklist
*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*
I have...
- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)
