Add Cache for RgbppLatestTransactions

[Flouse]

curl -k -w '\n* Response time: %{time_total}s\n' 'https://testnet-api.explorer.rgbpp.io/graphql' \
  -H 'content-type: application/json' \
  --data-raw '{"query":"\n        query RgbppLatestTransactions {\n          rgbppLatestTransactions(page: 1, pageSize: 10) {\n            txs {\n              ckbTxHash\n              btcTxid\n              leapDirection\n              blockNumber\n              timestamp\n              ckbTransaction {\n                blockNumber\n                hash\n                fee\n                size\n                inputs {\n                  status {\n                    consumed\n                    txHash\n                    index\n                  }\n                  txHash\n                  index\n                  capacity\n                  lock {\n                    codeHash\n                    hashType\n                    args\n                  }\n                  xudtInfo {\n                    symbol\n                    amount\n                    decimal\n                  }\n                }\n                outputs {\n                  txHash\n                  index\n                  capacity\n                  lock {\n                    codeHash\n                    hashType\n                    args\n                  }\n                  xudtInfo {\n                    symbol\n                    amount\n                    decimal\n                  }\n                  status {\n                    consumed\n                    txHash\n                    index\n                  }\n                }\n              }\n              btcTransaction {\n                blockHeight\n                blockHash\n                txid\n                version\n                size\n                locktime\n                weight\n                fee\n                confirmed\n              }\n            }\n            total\n            pageSize\n          }\n        }\n      ","operationName":"RgbppLatestTransactions"}'

• Response time: 4.863132s