Move settings in components

[NotWoods]

Summary

We set up our dependencies inside the Components class, except for Settings. This PR moves the Settings class into Components.

Motivation

The Settings class is a singleton that isn't easily mocked. Tests involving settings vary from using static mocks, overriding the singleton, and manipulating the internal SharedPreferences. Moving it into Components makes it easier to write tests by just using normal mocks.

Settings is probably a singleton just for historic reasons. A Settings singleton existed in Focus long before we had any components, and from there it made it to Fenix.

[eliserichards]

🚀

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@a13c6e8). Click here to learn what that means.
The diff coverage is 30.00%.

@@            Coverage Diff            @@
##             master   #12675   +/-   ##
=========================================
  Coverage          ?   26.71%           
  Complexity        ?      940           
=========================================
  Files             ?      400           
  Lines             ?    15936           
  Branches          ?     2033           
=========================================
  Hits              ?     4257           
  Misses            ?    11353           
  Partials          ?      326           

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/org/mozilla/fenix/FenixApplication.kt	13.01% <0.00%> (ø)	4.00 <0.00> (?)
...pp/src/main/java/org/mozilla/fenix/HomeActivity.kt	6.86% <0.00%> (ø)	13.00 <0.00> (?)
...illa/fenix/addons/InstalledAddonDetailsFragment.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...lla/fenix/components/toolbar/DefaultToolbarMenu.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...p/src/main/java/org/mozilla/fenix/home/HomeMenu.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...rc/main/java/org/mozilla/fenix/perf/Performance.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../quicksettings/QuickSettingsSheetDialogFragment.kt	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ix/trackingprotection/TrackingProtectionOverlay.kt	78.43% <0.00%> (ø)	10.00 <0.00> (?)
.../src/main/java/org/mozilla/fenix/utils/Settings.kt	61.25% <50.00%> (ø)	25.00 <1.00> (?)
...org/mozilla/fenix/components/BackgroundServices.kt	23.28% <75.00%> (ø)	0.00 <0.00> (?)
... and 4 more

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