Oracles: one-time-query and reply for contracts

[philippwerner]

• already implemented: qpi.queryOracle() -> send query to OM node -> receive response from OM node
• implement reply commit transactions
• implement reply reveal transaction
• implement timeout
• implement notification of contract
• implement request/response interface to get oracle query/reply info from the core node with qubic-cli
• seamless epoch transition
• contract for testing all related QPI features
• unit tests
• testnet test

[philippwerner]

Done:

• implement reply commit transactions
• implement reply reveal transaction
• implement timeout
• implement notification of contract
• fixed notifications and interface to work with snapshot save/load (save procedure IDs instead of C function pointers)

Partially done:

• implement request/response interface to get oracle query/reply info from the core node with qubic-cli
• implement logging of oracle query status changes
• contract for testing all related QPI features
• unit tests

Not started yet:

• seamless epoch transition
• testnet test