fix!: Charge gas for key length in gas meter (backport cosmos#10247) (c…

…osmos#10697)

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

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Closes: cosmos#10243

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

---

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- [ ] 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
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- [ ] 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
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- [ ] confirmed all CI checks have passed

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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)

(cherry picked from commit dcf67d7)

* Move to state machine breaking

* revert deletion

* Fix test

Co-authored-by: likhita-809 <78951027+likhita-809@users.noreply.github.com>
Co-authored-by: marbar3778 <marbar3778@yahoo.com>
Co-authored-by: Amaury M <1293565+amaurym@users.noreply.github.com>

store/gaskv/store_test.go

@@ -74,6 +74,7 @@ func TestGasKVStoreIterator(t *testing.T) {
 	vb := iterator.Value()
 	require.Equal(t, vb, valFmt(2))
 	iterator.Next()
+
 	require.Equal(t, types.Gas(14565), meter.GasConsumed())
 	kc := iterator.Key()
 	require.Equal(t, kc, keyFmt(3))
@@ -84,6 +85,7 @@ func TestGasKVStoreIterator(t *testing.T) {
 	require.False(t, iterator.Valid())
 	require.Panics(t, iterator.Next)
 	require.Equal(t, types.Gas(14697), meter.GasConsumed())
+
 	require.NoError(t, iterator.Error())
 
 	reverseIterator := st.ReverseIterator(nil, nil)
@@ -100,6 +102,7 @@ func TestGasKVStoreIterator(t *testing.T) {
 	reverseIterator.Next()
 	require.False(t, reverseIterator.Valid())
 	require.Panics(t, reverseIterator.Next)
+
 	require.Equal(t, types.Gas(15135), meter.GasConsumed())
 }