[CSDK-198] TransactionRuntime serialization

[davidatwhiletrue]

Summary

modify TransactionRuntime type and serialize stored/session targets as per new requirements for VM1.

TODO

Checklist

• Code is properly formatted
• [S] All commits are signed
• Tests included/updated or not needed
• Documentation (manuals or wiki) has been updated or is not required

[davidatwhiletrue]

After Artem review:

• Reverted Package to SmartContract renaming until this issue is clarified StoredValue::SmartContract serializes to Package property in JSON RPC resposnes casper-network/casper-node#5030
• Handled this change: Renaming StoredValue::LegacyTransfer to StoredValue::Transfer casper-network/casper-node#5034