feat: Add HasSupply method to bank keeper (cosmos#10393)

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## Description
Add `HasSupply` method to ensure that input denom actually exists on chain.

Closes: cosmos#10387 

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---

### Author Checklist

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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

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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)

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* [\#10393](https://github.com/cosmos/cosmos-sdk/pull/10393) Add `HasSupply` method to bank keeper to ensure that input denom actually exists on chain.
 * [\#9933](https://github.com/cosmos/cosmos-sdk/pull/9933) Introduces the notion of a Cosmos "Scalar" type, which would just be simple aliases that give human-understandable meaning to the underlying type, both in Go code and in Proto definitions.
 * [\#9884](https://github.com/cosmos/cosmos-sdk/pull/9884) Provide a new gRPC query handler, `/cosmos/params/v1beta1/subspaces`, that allows the ability to query for all registered subspaces and their respective keys.
 * [\#9860](https://github.com/cosmos/cosmos-sdk/pull/9860) Emit transaction fee in ante handler fee decorator. The event type is `tx` and the attribute is `fee`.

x/bank/keeper/keeper.go

@@ -26,6 +26,7 @@ type Keeper interface {
 	ExportGenesis(sdk.Context) *types.GenesisState
 
 	GetSupply(ctx sdk.Context, denom string) sdk.Coin
+	HasSupply(ctx sdk.Context, denom string) bool
 	GetPaginatedTotalSupply(ctx sdk.Context, pagination *query.PageRequest) (sdk.Coins, *query.PageResponse, error)
 	IterateTotalSupply(ctx sdk.Context, cb func(sdk.Coin) bool)
 	GetDenomMetaData(ctx sdk.Context, denom string) (types.Metadata, bool)
@@ -215,6 +216,13 @@ func (k BaseKeeper) GetSupply(ctx sdk.Context, denom string) sdk.Coin {
 	}
 }
 
+// HasSupply checks if the supply coin exists in store.
+func (k BaseKeeper) HasSupply(ctx sdk.Context, denom string) bool {
+	store := ctx.KVStore(k.storeKey)
+	supplyStore := prefix.NewStore(store, types.SupplyKey)
+	return supplyStore.Has([]byte(denom))
+}
+
 // GetDenomMetaData retrieves the denomination metadata. returns the metadata and true if the denom exists,
 // false otherwise.
 func (k BaseKeeper) GetDenomMetaData(ctx sdk.Context, denom string) (types.Metadata, bool) {

x/bank/keeper/keeper_test.go

@@ -1119,6 +1119,7 @@ func (suite *IntegrationTestSuite) TestBalanceTrackingEvents() {
 	}
 
 	// check balance and supply tracking
+	suite.Require().True(suite.app.BankKeeper.HasSupply(suite.ctx, "utxo"))
 	savedSupply := suite.app.BankKeeper.GetSupply(suite.ctx, "utxo")
 	utxoSupply := savedSupply
 	suite.Require().Equal(utxoSupply.Amount, supply.AmountOf("utxo"))