Implement hiding toolbars on full screen

[jotaemepereira]

Task/Issue URL: https://app.asana.com/0/0/1208939873445197/f
Tech Design URL:
CC:

Description:
Adds a setting that hides the tabs and bookmarks bar toolbars when on full-screen mode.

Steps to test this PR:

1. Go to Settings → Appearance → Check 'Remove Tabs and Bookmarks Bar toolbars on Full Screen'
2. Open a site
3. Enter full screen mode
4. The tabs toolbar and the bookmarks bar should be hidden automatically
5. When the user exits full screen mode, it should restore both toolbars
6. Disable the feature, both the bookmarks bar and the tabs toolbar should be visible on full screen

Definition of Done:

• Does this PR satisfy our Definition of Done?

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Internal references:

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