Element Call SPA integration (#1283)

* Integrate Element Call into EX, being able to open its URLs and handle the call in-app.
* Add custom scheme support with format `element:call?url=...`.
* Update androix.webkit
* Silence the foreground service notification.
- Allow foreground service tap action to re-open the ongoing call.
- Unify notification small icons in different modules using a vector one.

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

features/call/src/main/AndroidManifest.xml

@@ -0,0 +1,61 @@
+<!--
+  ~ Copyright (c) 2023 New Vector Ltd
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-feature android:name="android.hardware.camera" android:required="false" />
+    <uses-feature android:name="android.hardware.microphone" android:required="false" />
+
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+    <application>
+        <activity
+            android:name=".ElementCallActivity"
+            android:label="@string/element_call"
+            android:exported="true"
+            android:taskAffinity="io.element.android.features.call"
+            android:configChanges="screenSize|screenLayout|orientation|keyboardHidden|keyboard|navigation|uiMode"
+            android:launchMode="singleTask">
+
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="http" />
+                <data android:scheme="https" />
+
+                <data android:host="call.element.io" />
+            </intent-filter>
+            <!-- Custom scheme to handle urls from other domains in the format: element://call?url=https%3A%2F%2Felement.io -->
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="element" />
+                <data android:host="call" />
+            </intent-filter>
+
+        </activity>
+        <service android:name=".CallForegroundService" android:enabled="true" android:foregroundServiceType="mediaPlayback" />
+    </application>
+
+</manifest>