Support NTFS hidden files

Summary:
This patch implements function `isHiddenNtfs` which checks extended attribute `HIDDEN` of files from NTFS partitions and populates `UDSEntry` with `KIO::UDSEntry::UDS_HIDDEN`.
FEATURE: 171537

{F5747912}

Test Plan:
# Open Dolphin on Windows partition
# Check that "$Recycle.Bin", "MSOCache", "System Volume Information", etc. are hidden
# Show hidden files
# Check that Windows hidden files are displayed now

Reviewers: #dolphin, #frameworks, markg, dfaure

Reviewed By: dfaure

Subscribers: dfaure, markg, elvisangelaccio, ltoscano, anthonyfieroni, broulik, #frameworks, #dolphin

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D11204