[AL7] - Near Verifiable RPC Endpoints for Viewing Access Keys 🏅

Added proof generation support to RPC read access key endpoints on the NEAR protocol to help pave the road for light client support.

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Verifiable RPC replies

Pool 16,000 ETH

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Extended JSON RPC API for view_access_key and view_access_keys endpoints to support additional include_proof query parameters. Utilized existing trie iterator construct to track state trie nodes from root to some provided key argument node and store them as raw bytes in a vector representing the trie path. The vector is returned within a proof field as a part of the RPC response object.