InvokeHostFnOp to restore an entry if archived

[anupsdf]

In a future protocol release, when State Archival starts evicting persistent entries, those archived entries will need to be restored before they can be used. This makes it a two step process to use a previously archived ledger entry.

This tracking issue is to explore if we can restore the archived entry during InvokeHostFnOp call. This reduces having to write the entry twice (one for restoring and another for updating it) which also means we don't have to double charge the fees.

• Explore fees side of things
• Explore adding restoration proof in InvokeHostFnOp
• RPC interface changes if any
• Write a CAP