Fix 245

• Added the OwnerKeyChangePermission in the pallet_distance to verify if a given identity has the right to change its Account.
• Implemented the runtime handler for OwnerKeyChangePermission, which ensures that the current identity is not an active validator before changing the accountId. Closes #245 (closed).

pallets/distance/src/mock.rs

@@ -243,6 +243,7 @@ impl pallet_identity::Config for Test {
     type IdtyNameValidator = IdtyNameValidatorTestImpl;
     type OnNewIdty = ();
     type OnRemoveIdty = ();
+    type OwnerKeyChangePermission = ();
     type RuntimeEvent = RuntimeEvent;
     type Signature = TestSignature;
     type Signer = UintAuthorityId;