Async Lifecycle (#781)

* Drop support for 5.8

* Adopt new APIs

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.8
+// swift-tools-version:5.9
 import PackageDescription
 
 let package = Package(
@@ -13,7 +13,7 @@ let package = Package(
         .library(name: "Fluent", targets: ["Fluent"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/vapor/fluent-kit.git", from: "1.48.4"),
+        .package(url: "https://github.com/vapor/fluent-kit.git", from: "1.49.0"),
         .package(url: "https://github.com/vapor/vapor.git", from: "4.101.0"),
     ],
     targets: [
@@ -38,6 +38,10 @@ let package = Package(
 )
 
 var swiftSettings: [SwiftSetting] { [
+    .enableUpcomingFeature("ExistentialAny"),
     .enableUpcomingFeature("ConciseMagicFile"),
     .enableUpcomingFeature("ForwardTrailingClosures"),
+    .enableUpcomingFeature("ImportObjcForwardDeclarations"),
+    .enableUpcomingFeature("DisableOutwardActorInference"),
+    .enableExperimentalFeature("StrictConcurrency=complete"),
 ] }

Sources/Fluent/FluentProvider.swift

@@ -137,6 +137,10 @@ extension Application {
             func shutdown(_ application: Application) {
                 application.databases.shutdown()
             }
+
+            func shutdownAsync(_ application: Application) async {
+                await application.databases.shutdownAsync()
+            }
         }
 
         let application: Application

Tests/FluentTests/SessionTests.swift

@@ -113,4 +113,8 @@ struct StaticDatabase: DatabaseConfiguration, DatabaseDriver {
     func shutdown() {
         // Do nothing.
     }
+
+    func shutdownAsync() async {
+        // Do nothing
+    }
 }