Storage accounts need to be tied to the node that owns it

[sagar-solana]

Problem

Storage accounts have no knowledge of their owners. We need a way to work out which ContactInfo has the segments.

Proposed Solution

• Storage accounts can set a owner (permanent)
• Storage accounts can assume the account creator is the owner
• Validators store a map of segment<->storage_account and can use the bank to figure out which replicator owns each account.

Tag: @sakridge @pgarg66