Element Call ringing notifications (#2978)

- Add `ActiveCallManager` to handle incoming and ongoing calls.
- Add ringing call notifications with full screen intents and missed call ones as part of the 'conversation' notifications.

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

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/lambda/LambdaRecorder.kt

@@ -85,6 +85,13 @@ inline fun <reified T1, reified T2, reified T3, reified T4, reified T5, reified
     return LambdaSixParamsRecorder(ensureNeverCalled, block)
 }
 
+inline fun <reified T1, reified T2, reified T3, reified T4, reified T5, reified T6, reified T7, reified R> lambdaRecorder(
+    ensureNeverCalled: Boolean = false,
+    noinline block: (T1, T2, T3, T4, T5, T6, T7) -> R
+): LambdaSevenParamsRecorder<T1, T2, T3, T4, T5, T6, T7, R> {
+    return LambdaSevenParamsRecorder(ensureNeverCalled, block)
+}
+
 inline fun <reified R> lambdaAnyRecorder(
     ensureNeverCalled: Boolean = false,
     noinline block: (List<Any?>) -> R