[doc] Concept Proof

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Document Suggestion

Describe the Suggestion

介绍链上的状态 Proof 机制，包括 TransactionProof，StateProof，AccumulatorProof

对 get_transaction_proof 等接口的使用提供案例。

• https://cookbook.starcoin.org/docs/concepts/proof/

可能需要在

https://cookbook.starcoin.org/docs/web3/interacting-with-the-chain

下增加一个章节