fix!: Charge gas for key length in gas meter (#10247)

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## Description

Closes: #10243 

Charge the per-byte fee for the key length as for the values in gas meter

---

### 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)

x/authz/client/testutil/tx.go

@@ -971,6 +971,7 @@ func (s *IntegrationTestSuite) TestExecUndelegateAuthorization() {
 			"valid txn: (undelegate half tokens)",
 			[]string{
 				execMsg.Name(),
+				fmt.Sprintf("--%s=%s", flags.FlagGas, "250000"),
 				fmt.Sprintf("--%s=%s", flags.FlagFrom, grantee.String()),
 				fmt.Sprintf("--%s=%s", flags.FlagBroadcastMode, flags.BroadcastBlock),
 				fmt.Sprintf("--%s=%s", flags.FlagFees, sdk.NewCoins(sdk.NewCoin(s.cfg.BondDenom, sdk.NewInt(10))).String()),
@@ -984,6 +985,7 @@ func (s *IntegrationTestSuite) TestExecUndelegateAuthorization() {
 			"valid txn: (undelegate remaining half tokens)",
 			[]string{
 				execMsg.Name(),
+				fmt.Sprintf("--%s=%s", flags.FlagGas, "250000"),
 				fmt.Sprintf("--%s=%s", flags.FlagFrom, grantee.String()),
 				fmt.Sprintf("--%s=%s", flags.FlagBroadcastMode, flags.BroadcastBlock),
 				fmt.Sprintf("--%s=%s", flags.FlagFees, sdk.NewCoins(sdk.NewCoin(s.cfg.BondDenom, sdk.NewInt(10))).String()),
@@ -997,6 +999,7 @@ func (s *IntegrationTestSuite) TestExecUndelegateAuthorization() {
 			"failed with error no authorization found",
 			[]string{
 				execMsg.Name(),
+				fmt.Sprintf("--%s=%s", flags.FlagGas, "250000"),
 				fmt.Sprintf("--%s=%s", flags.FlagFrom, grantee.String()),
 				fmt.Sprintf("--%s=%s", flags.FlagBroadcastMode, flags.BroadcastBlock),
 				fmt.Sprintf("--%s=%s", flags.FlagFees, sdk.NewCoins(sdk.NewCoin(s.cfg.BondDenom, sdk.NewInt(10))).String()),
@@ -1061,6 +1064,7 @@ func (s *IntegrationTestSuite) TestExecUndelegateAuthorization() {
 			"valid txn",
 			[]string{
 				execMsg.Name(),
+				fmt.Sprintf("--%s=%s", flags.FlagGas, "250000"),
 				fmt.Sprintf("--%s=%s", flags.FlagFrom, grantee.String()),
 				fmt.Sprintf("--%s=%s", flags.FlagBroadcastMode, flags.BroadcastBlock),
 				fmt.Sprintf("--%s=%s", flags.FlagFees, sdk.NewCoins(sdk.NewCoin(s.cfg.BondDenom, sdk.NewInt(10))).String()),
@@ -1074,6 +1078,7 @@ func (s *IntegrationTestSuite) TestExecUndelegateAuthorization() {
 			"valid txn",
 			[]string{
 				execMsg.Name(),
+				fmt.Sprintf("--%s=%s", flags.FlagGas, "250000"),
 				fmt.Sprintf("--%s=%s", flags.FlagFrom, grantee.String()),
 				fmt.Sprintf("--%s=%s", flags.FlagBroadcastMode, flags.BroadcastBlock),
 				fmt.Sprintf("--%s=%s", flags.FlagFees, sdk.NewCoins(sdk.NewCoin(s.cfg.BondDenom, sdk.NewInt(10))).String()),