feat(services/monoiofs): impl read and write, add behavior test #4944
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Part of #4552.
This PR implements basic read and write operations for
monoiofs
. The implementation differs fromcompfs
in that file opened with monoio is stored within the worker thread because it is non-Send and non-Sync. Read and write operations send buffers to worker thread and receive results instead of send futures.This PR also introduces behavior tests for
monoiofs
. Implementations of stat and delete are borrowed fromFsBackend
to satisfy requirements of behavior tests. They are not implemented natively because monoio's support for file metadata is not released yet and file deletion is currently not implemented.