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[ISSUE 3585] [Part J] Use MappedByteBuffer instead of FileChannel to write consume queue and slave commitlog. (#3657)

This commit improve reput performance and speed up consume qps greatly. In our test, produce about 200,000 tps.
72 queue consume qps: from about 70,000 to 200,000
600 queue consume qps: from about 70,000 to 110,000

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