[components] Issue https://github.com/mozilla-mobile/android-components/issues/10335: Update dependencies to support Jetpack Compose and add first prototype components.

* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Upgrade to Gradle 7.
* Update Android Gradle Plugin to 7.0.0 Beta 2.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Generate BuildConfig with VERSION_CODE and VERSION_NAME fields in library modules (for Glean).
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Add first component using Jetpack Compose: compose-browser-toolbar.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Introduce Jetpack Compose bindings for lib-state.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Upstream Jetpack Compose toolbar prototype from Reference Browser.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Add TargetTab helper for observing specific tabs.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Add compose-engine component for adding Jetpack Compose bindings to a concept-engine implementation.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Add new sample app (samples-compose-browser) for prototyping browser UI using Jetpack Compose.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Update to Beta 3 of the Android Gradle plugin.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Allow usage of http when substituting maven repositories in CI.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Rename TabTarget helper to just Target.
* Issue https://github.com/mozilla-mobile/android-components/issues/10335: Make BrowserToolbar follow target tab too.
* Add awesomebar prototype using Jetpack Compose.
* Update to Gradle 7.0.2.

mobile/android/android-components/samples/toolbar/src/main/AndroidManifest.xml

@@ -15,7 +15,7 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.AppCompat.NoActionBar">
-        <activity android:name=".ToolbarActivity">
+        <activity android:name=".ToolbarActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />