Fix NIO imports (#171)

### Motivation

- SwiftNIO 2.32.0 introduces explicit modules for its Core and Posix.
- To write great platform independent code in most parts we should only ever import `NIOCore`

### Changes

- This pr explicitly imports NIOCore, NIOPosix and NIOEmbedded where needed.

Author: fabianfett

Package.swift

@@ -13,7 +13,7 @@ let package = Package(
         .library(name: "PostgresNIO", targets: ["PostgresNIO"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-nio.git", from: "2.28.0"),
+        .package(url: "https://github.com/apple/swift-nio.git", from: "2.32.0"),
         .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.12.0"),
         .package(url: "https://github.com/apple/swift-crypto.git", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-metrics.git", from: "2.0.0"),
@@ -25,12 +25,15 @@ let package = Package(
             .product(name: "Logging", package: "swift-log"),
             .product(name: "Metrics", package: "swift-metrics"),
             .product(name: "NIO", package: "swift-nio"),
+            .product(name: "NIOCore", package: "swift-nio"),
+            .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOTLS", package: "swift-nio"),
-            .product(name: "NIOFoundationCompat", package: "swift-nio"),
             .product(name: "NIOSSL", package: "swift-nio-ssl"),
+            .product(name: "NIOFoundationCompat", package: "swift-nio"),
         ]),
         .testTarget(name: "PostgresNIOTests", dependencies: [
             .target(name: "PostgresNIO"),
+            .product(name: "NIOEmbedded", package: "swift-nio"),
             .product(name: "NIOTestUtils", package: "swift-nio"),
         ]),
         .testTarget(name: "IntegrationTests", dependencies: [

Sources/PostgresNIO/Connection/PostgresConnection+Authenticate.swift

@@ -1,4 +1,5 @@
-import NIO
+import NIOCore
+import Logging
 
 extension PostgresConnection {
     public func authenticate(

Sources/PostgresNIO/Connection/PostgresConnection+Connect.swift

@@ -1,4 +1,6 @@
-import NIO
+import NIOCore
+import NIOSSL
+import Logging
 
 extension PostgresConnection {
     public static func connect(

Sources/PostgresNIO/Connection/PostgresConnection+Database.swift

@@ -1,3 +1,4 @@
+import NIOCore
 import Logging
 import struct Foundation.Data
 

Sources/PostgresNIO/Connection/PostgresConnection+Notifications.swift

@@ -1,4 +1,4 @@
-import NIO
+import NIOCore
 import Logging
 
 /// Context for receiving NotificationResponse messages on a connection, used for PostgreSQL's `LISTEN`/`NOTIFY` support.

Sources/PostgresNIO/Connection/PostgresConnection.swift

@@ -1,4 +1,4 @@
-import NIO
+import NIOCore
 import Logging
 import struct Foundation.UUID
 

Sources/PostgresNIO/Connection/PostgresDatabase+PreparedQuery.swift

@@ -1,4 +1,5 @@
-import Foundation
+import NIOCore
+import struct Foundation.UUID
 
 extension PostgresDatabase {
     public func prepare(query: String) -> EventLoopFuture<PreparedQuery> {

Sources/PostgresNIO/Data/PostgresData+Array.swift

@@ -1,3 +1,5 @@
+import NIOCore
+
 extension PostgresData {
     public init<T>(array: [T])
         where T: PostgresDataConvertible

Sources/PostgresNIO/Data/PostgresData+Bool.swift

@@ -1,3 +1,5 @@
+import NIOCore
+
 extension PostgresData {
     public init(bool: Bool) {
         var buffer = ByteBufferAllocator().buffer(capacity: 1)

Sources/PostgresNIO/Data/PostgresData+Bytes.swift

@@ -1,4 +1,5 @@
 import struct Foundation.Data
+import NIOCore
 
 extension PostgresData {
     public init<Bytes>(bytes: Bytes)