chore(attestation): remove collector

[JayT106]

Remove collector based on the discussion in here #1948 (comment)

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[thomas-nguy]

cleanup looks good but can you tell me why do we need a rpcClient?

[JayT106]

cleanup looks good but can you tell me why do we need a rpcClient?

It's a cometbft rpc client to let cosmos module to access the history block data since we don't store the block or the block metadata in app side.

BTW, found we can use local client to remove HTTP overhead and network latency.