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/analyticsproviders/test/src/main/kotlin/io/element/android/services/analyticsproviders/test/FakeAnalyticsProvider.kt

@@ -13,6 +13,7 @@ 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.analyticsproviders.api.AnalyticsProvider
+import io.element.android.services.analyticsproviders.api.AnalyticsTransaction
 import io.element.android.tests.testutils.lambda.lambdaError
 
 class FakeAnalyticsProvider(
@@ -32,4 +33,5 @@ class FakeAnalyticsProvider(
     override fun updateUserProperties(userProperties: UserProperties) = updateUserPropertiesLambda(userProperties)
     override fun trackError(throwable: Throwable) = trackErrorLambda(throwable)
     override fun updateSuperProperties(updatedProperties: SuperProperties) = updateSuperPropertiesLambda(updatedProperties)
+    override fun startTransaction(name: String, operation: String?): AnalyticsTransaction? = null
 }