feat(oli): oli stat should show path as specified by users

[sarutak]

Related issue: fix #2841

This PR proposes to change oli stat to show the result of path field like as Linux's stat.
Before this change, when we run oli stat for a path, the root is omitted.

$ oli stat /path/to/file
path: path/to/file
size: 6307
type: file
last-modified: 2023-08-07 22:31:52.987908713 UTC

After this change, the root is prepended.

$ oli stat /path/to/file
path: path/to/file
size: 6307
type: file
last-modified: 2023-08-07 22:31:52.987908713 UTC

Also, a path are shown as specified by users like Linux's stat does.

$ stat ./myfile
  File: ./myfile
  Size: 6307      	Blocks: 16         IO Block: 4096   regular file
Device: 10304h/66308d	Inode: 1328196138  Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/     kou)   Gid: ( 1000/     kou)
Access: 2023-08-10 04:48:01.320407752 +0900
Modify: 2023-08-08 07:31:52.987908713 +0900
Change: 2023-08-08 07:31:52.987908713 +0900
 Birth: -

[Xuanwo]

Thanks!