fix: change zktrie iterator key format

[jyc228]

The https://github.com/kroma-network/go-ethereum/issues/71 issue was resolved in the snapsync commit, but it was decided to separate it from snapsync.

Summary by CodeRabbit

• New Features
  • Enhanced data handling in trie structures with the introduction of a new data field for improved efficiency and accuracy.
  • Added new functionalities for iterator key management in trie data structures, facilitating better conversion and handling of keys.
  • Introduced new methods for creating and managing tree paths using big integers, expanding the capabilities for tree path manipulation.

[coderabbitai[bot]]

Walkthrough

The recent modifications enhance the trie data structure by introducing a new data field in the leaf node iterator, refining the handling of node data in the trie. It also establishes a framework for iterator key management, facilitating the conversion between bytes and iterator keys. Additionally, the updates improve the interaction with tree paths by adding functions for creating and converting paths using big integers, ensuring more versatile and efficient tree navigation and data management.

Changes

Files	Change Summary
trie/iterator.go	Introduced a new data field in merkleTreeIteratorLeafNode, replacing blob in some contexts. Adjusted blob and data handling in zkMerkleTreeNodeBlobFunctions and zktrieNodeBlobFunctions. LeafBlob method now returns data; LeafProof retrieves Blob instead of Hash.
trie/iterator_key.go	Added functionality for defining an iterator key and managing key <-> iterator key conversion for trie structures.
trie/zk/tree_path.go	Implemented NewTreePathFromHashBig and NewTreePathFromBig for creating tree paths from *big.Int. Added ToBigInt method for converting a TreePath to a *big.Int.

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