create new Sync section in settings

[rebron]

Description

Create new Extensions section in Settings beneath Extensions and before Shield Settings section
Label section - 'Sync'
Label in sidebar - 'Sync'
Add item to: 'Manage, add or remove synced devices'
This will launch into the Brave Sync UI.

Display Device Name of device being synced and Last Activity.
See design.

Design

[bsclifton]

Should be similar to brave/brave-core#436

[srirambv]

@rebron the current implementation isn't as per the spec mentioned in original issue comment. Is this still the expected behaviour?

Create new Extensions section in Settings beneath Extensions and before Shield Settings section - Fail(Its below shields settings and there is no extensions setting option)

Label section - 'Sync' - Fail (shows as Brave Sync)

Label in sidebar - 'Sync' - Fail (no sidebar menu)

Add item to: 'Manage, add or remove synced devices' - Fail (not implemented yet)

Display Device Name of device being synced and Last Activity. - Pass (but shows long date time format and not as per screenshot)

cc: @brave/legacy_qa

[btlechowski]

Verification passed on

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Windows 7

Some follow up issues:
#2592
#2593
#2594

Verified passed with

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Mac OS X

• Verified devices listed on brave://sync page
  
• Verified follow up issues listed above apply to macOS

Verification passed on Ubuntu 17.10

Brave	0.58.14 Chromium: 71.0.3578.98 (Official Build) (64-bit)
Revision	15234034d19b85dcd9a03b164ae89d04145d8368-refs/branch-heads/3578@{#897}
OS	Linux

[srirambv]

Thanks for logging the followup issues @btlechowski 👍