chore: ConnectionPoolSettings from ConnectionFactoryProvider (#442)

* for the new closeCallsExceeding paramater in R2dbcExecutor, needed from R2dbcProjection

Author: patriknw

core/src/main/scala/akka/persistence/r2dbc/ConnectionFactoryProvider.scala

@@ -22,6 +22,7 @@ import scala.concurrent.Future
 import scala.concurrent.duration.Duration
 
 import akka.annotation.InternalApi
+import akka.annotation.InternalStableApi
 
 object ConnectionFactoryProvider extends ExtensionId[ConnectionFactoryProvider] {
   def createExtension(system: ActorSystem[_]): ConnectionFactoryProvider = new ConnectionFactoryProvider(system)
@@ -71,6 +72,13 @@ class ConnectionFactoryProvider(system: ActorSystem[_]) extends Extension {
     }
   }
 
+  /**
+   * INTERNAL API
+   */
+  @InternalStableApi
+  def connectionPoolSettingsFor(configLocation: String): ConnectionPoolSettings =
+    connectionFactorySettingsFor(configLocation).poolSettings
+
   private def createConnectionPoolFactory(
       settings: ConnectionPoolSettings,
       connectionFactory: ConnectionFactory): ConnectionPool = {