Feature Request: Expose AncestryProof to grapqhQL schema

[45930]

Nori is interested in the relationship between different Mina blocks for the purposes of including finality guarantees in their bridge proofs. The ability to prove that a given current best tip is a nth-degree descendant of a target block, where n is some finality threshold is critical to their bridge.

The internal p2p protocol exposes get_ancestry, which seems close to what is needed, but there is no public graphQL access to the required values.

Proposed Schema

getAncestryProof(block: StateHash, depth: Int): StateHash[]

block is the state hash of the current best tip, and depth is how many blocks of ancestors are requested.

Poseidon hashing the resulting array should produce the input hash, and the bridge can independently verify that the input hash is a valid block on Mina by verifying the blockchain proof.