[Refactor] Refactor IO stack

[platoneko]

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Description

For more details see https://cwiki.apache.org/confluence/display/DORIS/DSIP-006%3A+Refactor+IO+stack

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[platoneko]

Currently, Doris IO related code dependencies:
Rowset -> BlockManager -> ReadableBlock/WritableBlock -> Env
Scanner -> FileReader
FileResultWriter -> FileWriter

Expected dependencies:
Rowset -> FileSystem -> ReadStream/WriteStream (different Rowset may use different FileSystem backend)
Scanner -> ReadStream
FileResultWriter -> WriteStream

FileSystem provides APIs for directory and file management, and may manage the file cache in the future.
ReadStream/WriteStream may contain buffer and prefetch data in parallel.