feat(TrieProvider): Abstract TrieNode retrieval

[hashcashier]

This PR refactors the TrieProvider to change the the method for fetching trie node data into one that provides TrieNode instances instead of raw rlp-encoded bytes:
Before

fn trie_node_preimage(&self, key: B256) -> Result<Bytes, Self::Error>;

After

fn trie_node_by_hash(&self, key: B256) -> Result<TrieNode, Self::Error>;

This allows TrieProvider implementations to abstract away the details of how the required instance can be created and authenticated (i.e. through RLP decoding pre-image oracle answers on-demand or otherwise). This is useful for providing entire trees as query answers, instead of single nodes with blinded children.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.1%. Comparing base (71e35a7) to head (92e52fb).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/mpt/src/node.rs	75.0%	1 Missing ⚠️

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[clabby]

Fan of this change. LGTM