Create addUserData method in the analytics providers

This allows us to globally add arbitrary data to the events and transactions

services/analyticsproviders/api/src/main/kotlin/io/element/android/services/analyticsproviders/api/trackers/AnalyticsTracker.kt

@@ -35,6 +35,11 @@ interface AnalyticsTracker {
      * Super properties are added to any tracked event automatically.
      */
     fun updateSuperProperties(updatedProperties: SuperProperties)
+
+    /**
+     * Adds user data that will be sent with every event.
+     */
+    fun addUserData(key: String, value: String) {}
 }
 
 fun AnalyticsTracker.captureInteraction(name: Interaction.Name, type: Interaction.InteractionType? = null) {