update pin key when the user symmetric key is set

- always set the protected pin so we can recreate pin key from user symmetric key
- stop using EncryptionPair in account
- use EncString for both pin key storage
- update migration from old strategy on lock component

libs/common/src/enums/key-suffix-options.enum.ts

@@ -1,4 +1,5 @@
 export enum KeySuffixOptions {
   Auto = "auto",
   Biometric = "biometric",
+  Pin = "pin",
 }