Add some performance metrics for Sentry (#5760)

- Add `AnalyticsService.startTransaction(...)` to start a logging transaction that can be uploaded to Sentry if the user enabled the analytics upload.
- Add `AnalyticsTransaction` wrapper to abstract the Sentry ones.
- Added several helper methods to improve the UX around these transactions.
- Then measure:
  - Time until the first sync, and how it ended.
  - Time until the first rooms are displayed.
  - Time to load a room or a preview.
  - Time to load a timeline.

services/analytics/test/src/main/kotlin/io/element/android/services/analytics/test/FakeAnalyticsService.kt

@@ -12,8 +12,11 @@ import im.vector.app.features.analytics.itf.VectorAnalyticsEvent
 import im.vector.app.features.analytics.itf.VectorAnalyticsScreen
 import im.vector.app.features.analytics.plan.SuperProperties
 import im.vector.app.features.analytics.plan.UserProperties
+import io.element.android.services.analytics.api.AnalyticsLongRunningTransaction
 import io.element.android.services.analytics.api.AnalyticsService
+import io.element.android.services.analytics.api.NoopAnalyticsTransaction
 import io.element.android.services.analyticsproviders.api.AnalyticsProvider
+import io.element.android.services.analyticsproviders.api.AnalyticsTransaction
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -65,4 +68,8 @@ class FakeAnalyticsService(
     override fun updateSuperProperties(updatedProperties: SuperProperties) {
         // No op
     }
+
+    override fun startTransaction(name: String, operation: String?): AnalyticsTransaction = NoopAnalyticsTransaction
+    override fun startLongRunningTransaction(longRunningTransaction: AnalyticsLongRunningTransaction) {}
+    override fun stopLongRunningTransaction(longRunningTransaction: AnalyticsLongRunningTransaction) {}
 }