Add -d option to basename to output directory name

[rkarahan80]

This commit introduces a new -d command-line option to the basename utility. When this option is used, basename will output the directory portion of the given path, similar to the dirname command.

The -d option is mutually exclusive with the existing -a (multiple arguments) and -s (suffix) options. If -d is used in combination with either -a or -s, or if multiple path arguments are provided with -d, basename will print a usage error and exit.

The following changes were made:

• Modified usr.bin/basename/basename.c to implement the -d option, including error handling for conflicting options.
• Updated the usage message in basename.c to include the new option.
• Updated the manual page usr.bin/basename/basename.1 to document the -d option, its behavior, and its mutual exclusivity with other options.
• Added a new test script usr.bin/basename/tests/basename_test.sh with comprehensive test cases for the new -d option and to ensure existing functionality remains unaffected. Test cases cover various path types, trailing slashes, root paths, empty strings, and option conflicts. Signed-off-by: Recep Karahan [email protected]

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