For #964: Adds ability to disable each suggestion provider

[sblatz]

Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• Tests: This PR includes thorough tests or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

[codecov-io]

Codecov Report

Merging #5096 into master will decrease coverage by 0.06%.
The diff coverage is 20.45%.

@@             Coverage Diff             @@
##             master   #5096      +/-   ##
===========================================
- Coverage      8.87%   8.81%   -0.07%     
+ Complexity      195     192       -3     
===========================================
  Files           234     231       -3     
  Lines          9224    9169      -55     
  Branches       1334    1332       -2     
===========================================
- Hits            819     808      -11     
+ Misses         8351    8308      -43     
+ Partials         54      53       -1

Impacted Files	Coverage Δ	Complexity Δ
...va/org/mozilla/fenix/components/metrics/Metrics.kt	18.33% <ø> (+0.1%)	0 <0> (ø)	⬇️
...org/mozilla/fenix/settings/SearchEngineFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...lla/fenix/components/toolbar/ToolbarIntegration.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
.../mozilla/fenix/search/awesomebar/AwesomeBarView.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...in/java/org/mozilla/fenix/search/SearchFragment.kt	0% <0%> (ø)	0 <0> (ø)	⬇️
...va/org/mozilla/fenix/search/SearchFragmentStore.kt	63.63% <0%> (-4.11%)	1 <0> (ø)
.../src/main/java/org/mozilla/fenix/utils/Settings.kt	80.8% <100%> (+1.23%)	15 <0> (ø)	⬇️
app/src/main/java/org/mozilla/fenix/ext/Session.kt	12.5% <0%> (-1.79%)	0% <0%> (ø)
...in/java/org/mozilla/fenix/share/ShareController.kt	79.31% <0%> (-1.46%)	0% <0%> (ø)
...a/org/mozilla/fenix/settings/TurnOnSyncFragment.kt	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 22 more

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[jyeontaek]

Looks good! Just a nit, I think we should take this opportunity to rename showSuggestions to showSearchSuggestions just to make it a bit clearer.

[sblatz]

Great point--in fact the kdoc comment above it even specifies it's a search suggestion not just a suggestion. Updated 😄