Support POSIX RandomRWFile
Summary: Add Env::RandomRWFile in env.h and implement it for POSIX RandomRWFile is a file that allow us to read from / write to random offsets in the file I will implement it for other Envs later after finishing the whole task for AddFile() Test Plan: unit tests Reviewers: andrewkr, kradhakrishnan, sdong Reviewed By: sdong Subscribers: andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D62433
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