[smt] Rename hashtag to SMTNode and replace the HashValue with SMTNodeHash

[jolestar]

Summary

1. Rename the hashtag from rooch-smt to SMTNode because smt may be used in a different project than rooch.
2. Replace the HashValue with SMTNodeHash.
3. Improve the Merkle hash calculation.

Part of #2402

Do a simple benchmark:

1. Before #2401

2. After #2401

3. this PR

The db performance is regressed; maybe it is caused by disk usage.

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Name	Status	Preview	Comments	Updated (UTC)
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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **rooch** | ⬜️ Ignored ([Inspect](https://vercel.com/rooch/rooch/Db9qnjdPtSJZtaK3NvseQNmJvQ6p)) | [Visit Preview](https://rooch-git-refactorsmthash-rooch.vercel.app) | | Aug 29, 2024 8:24am |

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