Utilities: Add the listdir utility

This utility uses the Core::DirIterator facility which in turn uses the
get_dir_entries syscall. Therefore, this utility lets us to view the
actual values for inode numbers, and entry type value for directory
entries.

Base/usr/share/man/man1/listdir.md

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+## Name
+
+lsdir - list directory entries
+
+## Synopsis
+
+```**sh
+# lsdir [options...] [path...]
+```
+
+## Description
+
+This utility will list all directory entries of a given path (or list of paths)
+and print their inode number and file type (in either POSIX DT_* format or human readable).
+
+The utility uses `LibCore` `DirIterator` object and restrict its functionality
+to the `get_dir_entries` syscall only, to get the raw values of each directory
+entry.
+
+## Options
+
+* `-P`, `--posix-names`: Show POSIX names for file types
+* `-t`, `--total-entries-count`: Print count of listed entries when traversing a directory
+
+## Arguments
+
+* `path`: Directory to list
+
+## Examples
+
+```sh
+# List directory entries of working directory
+$ lsdir
+# List directory entries of /proc directory 
+$ lsdir /proc
+# List directory entries of /proc directory with POSIX names for file types
+$ lsdir -P /proc
+# List directory entries of /proc directory and print in the end the count of traversed entries
+$ lsdir -t /proc
+```
+
+## See also
+* [`ls`(1)](help://man/1/ls)