feat: staking config (#10988)

## Description

staking config to remove DefaultPowerReduction global. 

I want to see if this would be accepted as its easier to document and show users how to do this. 



---

### 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)

types/globals.go

@@ -17,16 +17,3 @@ const (
 	// https://tendermint.com/docs/spec/abci/apps.html#endblock
 	ValidatorUpdateDelay int64 = 1
 )
-
-// DefaultPowerReduction is the default amount of staking tokens required for 1 unit of consensus-engine power
-var DefaultPowerReduction = NewIntFromUint64(1000000)
-
-// TokensToConsensusPower - convert input tokens to potential consensus-engine power
-func TokensToConsensusPower(tokens Int, powerReduction Int) int64 {
-	return (tokens.Quo(powerReduction)).Int64()
-}
-
-// TokensFromConsensusPower - convert input power to tokens
-func TokensFromConsensusPower(power int64, powerReduction Int) Int {
-	return NewInt(power).Mul(powerReduction)
-}

types/module/module.go

@@ -335,7 +335,7 @@ func (m *Manager) InitGenesis(ctx sdk.Context, cdc codec.JSONCodec, genesisData
 
 	// a chain must initialize with a non-empty validator set
 	if len(validatorUpdates) == 0 {
-		panic(fmt.Sprintf("validator set is empty after InitGenesis, please ensure at least one validator is initialized with a delegation greater than or equal to the DefaultPowerReduction (%d)", sdk.DefaultPowerReduction))
+		panic(fmt.Sprintf("validator set is empty after InitGenesis, please ensure at least one validator is initialized with a delegation greater than or equal to the DefaultPowerReduction, found in x/staking/types/config.go"))
 	}
 
 	return abci.ResponseInitChain{

types/staking_test.go

@@ -1,26 +0,0 @@
-package types_test
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/suite"
-
-	sdk "github.com/cosmos/cosmos-sdk/types"
-)
-
-type stakingTestSuite struct {
-	suite.Suite
-}
-
-func TestStakingTestSuite(t *testing.T) {
-	suite.Run(t, new(stakingTestSuite))
-}
-
-func (s *stakingTestSuite) SetupSuite() {
-	s.T().Parallel()
-}
-
-func (s *stakingTestSuite) TestTokensToConsensusPower() {
-	s.Require().Equal(int64(0), sdk.TokensToConsensusPower(sdk.NewInt(999_999), sdk.DefaultPowerReduction))
-	s.Require().Equal(int64(1), sdk.TokensToConsensusPower(sdk.NewInt(1_000_000), sdk.DefaultPowerReduction))
-}