Merge PR #3243: allow multiple simultaneous redelegations/ubds between same delegator/validator(s) addresses

* remove kv seperation for marshalling

* pending

* cleanup

* cleanup x2

* pending

* working

* minor refactors

* entry structs defined

* uncompiled mechanism written

* add many compile fixes

* code compiles

* fix test compile errors

* test cover passes

* ...

* multiple entries fix

* ...

* more design fix

* working

* fix test cover bug

* Update PENDING.md

* update comment around queue completion for redelegations/ubds

* basic spec updates

* remove ErrConflictingRedelegation

* @cwgoes comments are resolved

* Update x/staking/keeper/slash.go

Co-Authored-By: rigelrozanski <rigel.rozanski@gmail.com>

* address @alexanderbez comments

cmd/gaia/cli_test/cli_test.go

@@ -303,7 +303,8 @@ func TestGaiaCLICreateValidator(t *testing.T) {
 	// Get unbonding delegations from the validator
 	validatorUbds := f.QueryStakingUnbondingDelegationsFrom(barVal)
 	require.Len(t, validatorUbds, 1)
-	require.Equal(t, "1", validatorUbds[0].Balance.Amount.String())
+	require.Len(t, validatorUbds[0].Entries, 1)
+	require.Equal(t, "1", validatorUbds[0].Entries[0].Balance.Amount.String())
 
 	// Query staking parameters
 	params := f.QueryStakingParameters()