ShellPkg/HandleParsingLib: Show LoadedImageProtocol file path as text

ShellPkg/HandleParsingLib: Show LoadedImageProtocol file path as text

This patch adds support for displaying a text representation of the file
path associated with a LoadedImageProtocol. This is a behavior that was
present in the old shell but has been lost in the new shell.

For example, using 'dh -v' in the old shell:

    FilePath......: FvFile(F3331DE6-4A55-44E4-B767-7453F7A1A021)
    FilePath......: \EFI\BOOT\BOOTX64.EFI

vs. the new shell:

    FilePath......: 3A539018
    FilePath......: 3A728718

This seems like useful information for the shell to display.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>