[Storehouse] 001 Part2 - Add payloadless trie test cases

[zhangchiqing]

This PR adds test cases for payloadless node and trie implementation.

• Adds equivalence_test.go: asserts the payloadless trie matches the regular mtrie on root hash, leaf hashes, reads, proofs, and register counts across builds, incremental updates, full unallocation, and a random allocate/unallocate walk (with and without pruning).
• Created trie_test.go, node_test.go, and json_test.go against the simplified payloadless API by referencing the existing tests.

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