feature: support SMT library and tools #303
Description
https://github.com/nervosnetwork/sparse-merkle-tree
A quick way is to use WASM, like: https://github.com/joii2020/smt-wasm/tree/master
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https://github.com/nervosnetwork/sparse-merkle-tree
A quick way is to use WASM, like: https://github.com/joii2020/smt-wasm/tree/master