Add source information to downloads

[tewe]

Description

On macOS, Safari sets an extended file system attribute called kMDItemWhereFroms on every download, to preserve the source. This is useful for files with generic names, especially when using automation like Hazel.

Please consider copying this feature.

Steps to Reproduce

1. Download a file
2. xattr -l

Actual result:

Just com.apple.quarantine

Expected result:

Also com.apple.metadata:kMDItemWhereFroms

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.34.81 Chromium: 97.0.4692.99 (Official Build) (x86_64)
Revision	d740da257583289dbebd2eb37e8668928fac5ead-refs/branch-heads/4692@{#1461}
OS	macOS Version 10.14.6 (Build 18G9323)