Allow L0 -> L1 compaction use IOPriority::IO_MID
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enhancement
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- C++
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Description
As we know that the slow L0 -> L1 compaction will cause write stall which cause high latency for online application.
Rocksdb have added IOPriority::IO_MID for rate limiter. It's better to all L0-L1 compaction use IO_MID to reduce the writing stall.
### Expected behavior
Use can config the Rocksdb to use IO_MID for L0 -> L1 compaction for rate limiter.
### Actual behavior
### Steps to reproduce the behavior
Contributor guide
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