chore: math lib update and type fixes (#12791)

## 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

---

### 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/main/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/main/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/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)

testutil/network/network.go

@@ -483,7 +483,7 @@ func New(l Logger, baseDir string, cfg Config) (*Network, error) {
 			valPubKeys[i],
 			sdk.NewCoin(cfg.BondDenom, cfg.BondedTokens),
 			stakingtypes.NewDescription(nodeDirName, "", "", "", ""),
-			stakingtypes.NewCommissionRates(commission, sdk.OneDec(), sdk.OneDec()),
+			stakingtypes.NewCommissionRates(commission, math.LegacyOneDec(), math.LegacyOneDec()),
 			math.OneInt(),
 		)
 		if err != nil {

testutil/sims/app_helpers.go

@@ -195,15 +195,15 @@ func GenesisStateWithValSet(codec codec.Codec, genesisState map[string]json.RawM
 			Jailed:            false,
 			Status:            stakingtypes.Bonded,
 			Tokens:            bondAmt,
-			DelegatorShares:   sdk.OneDec(),
+			DelegatorShares:   math.LegacyOneDec(),
 			Description:       stakingtypes.Description{},
 			UnbondingHeight:   int64(0),
 			UnbondingTime:     time.Unix(0, 0).UTC(),
-			Commission:        stakingtypes.NewCommission(sdk.ZeroDec(), sdk.ZeroDec(), sdk.ZeroDec()),
+			Commission:        stakingtypes.NewCommission(math.LegacyZeroDec(), math.LegacyZeroDec(), math.LegacyZeroDec()),
 			MinSelfDelegation: math.ZeroInt(),
 		}
 		validators = append(validators, validator)
-		delegations = append(delegations, stakingtypes.NewDelegation(genAccs[0].GetAddress(), val.Address.Bytes(), sdk.OneDec()))
+		delegations = append(delegations, stakingtypes.NewDelegation(genAccs[0].GetAddress(), val.Address.Bytes(), math.LegacyOneDec()))
 
 	}
 	// set validators and delegations