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.

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

tools/lint/lint.xml

@@ -48,6 +48,8 @@
         <ignore path="**/localazy.xml" />
         <!-- Ignore unused resource in debug build type -->
         <ignore path="**/src/debug/**" />
+        <!-- Ignore unused resources in designsystem since they're imported elsewhere through aliases and can't be properly detected -->
+        <ignore path="**/libraries/designsystem/src/main/res/**" />
     </issue>
 
     <!-- UX -->