Have a tool to check the missing tx for token bridge

[Kailai-Wang]

Context

When the relayer servers are down, txs can still be submitted during the downtime.
Restarting the relayers later won't scan for missing txs in a backtracking way.

We would need either a tool/script or live monitoring to check this.

We can look for ChainBridge.FungibleTransfer events and extract the nonces and destination ERC20 addresses, and check if the destination receives the tokens.

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@litentry/parachain