Provide a server implementation of the LocalStateQuery protocol

[mrBliss]

The wallet will communicate with the node using the LocalStateQuery protocol: https://github.com/input-output-hk/ouroboros-network/blob/2c4fa419346ab2c24e12ba7950fde4faed173191/ouroboros-network/src/Ouroboros/Network/Protocol/LocalStateQuery/Type.hs

Consensus must implement the server side of this protocol. It should be relatively straightforward to implement it using the LedgerDB.

[mrBliss]

This will only be needed for Shelley, apparently.

[mrBliss]

Partially blocked by query: we don't know yet which kind of queries the wallet needs.