ADS: Move all ADS modules under the same folder (#6975)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1202552961248957/task/1211716560268930?focus=true

### Description
Move all ADS related modules under the same folder

### Steps to test this PR

_Smoke tests_
- [x] Open the app installing the Play flavour
- [x] Play around to verify nothing is broken

_Play Flavour_
- [x] Open the app installing the Play flavour
- [x] Navigate to settings
- [x] Verify that the ADS Preview feature is not visible

_Internal Flavour_
- [x] Open the app installing the Internal flavour
- [x] Navigate to settings
- [x] Verify that the ADS Preview feature is visible

Author: malmstein

.github/CODEOWNERS

@@ -1,5 +1,6 @@
 # This is the module where the Android Design System resides
 # Any changes to the source files of this module require approval from @malmstein or @nalcalag.
-/common/common-ui/ @malmstein @nalcalag
+/android-design-system/design-system/ @malmstein @mikescamell
+/android-design-system/design-system-internal/ @malmstein @mikescamell
 /saved-sites/ @malmstein
 /example-feature/ @cdrussell

android-design-system/design-system-internal/build.gradle

@@ -26,7 +26,18 @@ android {
     anvil {
         generateDaggerFactories = true // default is false
     }
+    lint {
+        baseline = file("lint-baseline.xml")
+    }
     namespace 'com.duckduckgo.common.ui.internal'
+
+    buildFeatures {
+        compose true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = "_"
+    }
 }
 
 dependencies {
@@ -42,11 +53,13 @@ dependencies {
     implementation project(path: ':app-build-config-api')
     implementation project(':internal-features-api')
     implementation project(path: ':navigation-api')
+    implementation "androidx.datastore:datastore-preferences:_"
 
     implementation AndroidX.appCompat
     implementation Google.android.material
     implementation AndroidX.constraintLayout
     implementation AndroidX.core.splashscreen
+    implementation AndroidX.fragment.ktx
     implementation AndroidX.recyclerView
     implementation AndroidX.lifecycle.viewModelKtx
     // just to get the dagger annotations