Yanqin Jin 9e15f7bff3 Sort per-file blob read requests by offset (#8953)
Summary:
`RandomAccessFileReader::MultiRead()` tries to merge requests in direct IO, assuming input IO requests are
sorted by offsets.

Add a test in direct IO mode.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8953

Test Plan: make check

Reviewed By: ltamasi

Differential Revision: D31183546

Pulled By: riversand963

fbshipit-source-id: 5d043ec68e2daa47a3149066150afd41ee3d73e6
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