Add PIN usage in docs/en/Alluxio_Storage.md and support alluxio fs pin shows pinned file paths.

Description

Add documentation of alluxio fs pin/unpin shell commands in docs/en/Alluxio-Storage.md
to tell users if they want files not be evicted, they could use pin commands.

In addition, it would be better for alluxio fs pin command with no arguments to show the pinned file paths(like alluxio fs mount did), so that users could know what files they pinned and should be unpinned as time goes by.

Environment

None

Activity

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Assignee

Unassigned

Reporter

Lu

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