Investigate implementation for eth_getProof

[konstantinabl]

[konstantinabl]

Currently, it seems like we won't be able to implement this method. Specifically, this method requires generating a Merkle proof for a given account and potentially a storage proof for that account’s associated storage slots. To generate these proofs, access to the state trie is required.
However, in the context of Hedera's architecture, particularly at the relay layer, we currently do not have access to the state trie. This information is not exposed via the Mirror Node (MN) or available through the SDK, making it technically infeasible to retrieve or construct the required proofs.
This limitation is a known issue and is further detailed in the Hedera documentation, particularly in the section discussing differences in Ethereum RPC behavior via the JSON-RPC relay https://docs.hedera.com/hedera/core-concepts/smart-contracts/understanding-hederas-evm-differences-and-compatibility/for-evm-developers-migrating-to-hedera/json-rpc-relay-and-evm-tooling#ethereum-rpc-api-behavior-via-json-rpc-relay.
Currently, these limitations are being addressed with the developmen of BlockNode and BlockStreams and we expect to be able to overcome them and implement the getProof endpoint