fix memory related #16920
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fix memory related #16920
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What type of PR is this?
Which issue(s) this PR fixes:
issue #https://github.com/matrixorigin/MO-Cloud/issues/3388
What this PR does / why we need it:
原因：
1, []byte转string 重新分配了内存。
2, 不停的append 网络payload，会不停的分配堆内存。并且有内存移动。
修改：
1,[]byte转string。用UnsafeBytesToString。
2,先保存payload。最终一次性用mpool分配内存，再拼接。然后mpool释放内存。压力在mpool上，而不是在go heap上了。