Fix compiler and linter issues

Author: fpseverino

Sources/Mailgun/Extensions/MailgunClient+parse.swift

@@ -1,4 +1,4 @@
-import Vapor
+public import Vapor
 
 extension MailgunClient {
     func parse(response: ClientResponse) throws -> ClientResponse {

Sources/Mailgun/Extensions/MailgunClient+postRequest.swift

@@ -1,5 +1,5 @@
 import AsyncHTTPClient
-import Vapor
+public import Vapor
 
 extension MailgunClient {
     func postRequest<Message: Content>(_ content: Message, endpoint: String) async throws -> ClientResponse {

Sources/Mailgun/Models/MailgunConfiguration.swift

@@ -1,5 +1,5 @@
 public import Configuration
-import Vapor
+public import Vapor
 
 public struct MailgunConfiguration: Sendable {
     /// API key (including "key-" prefix)

Sources/Mailgun/Models/MailgunIncomingMessage.swift

@@ -1,4 +1,4 @@
-import Vapor
+public import Vapor
 
 public struct MailgunIncomingMessage: Content {
     public static var defaultContentType: HTTPMediaType { .formData }
@@ -65,7 +65,7 @@ public struct MailgunIncomingMessage: Content {
 
         var _attachments: [File] = []
         let attachmentsContainer = try decoder.container(keyedBy: DynamicAttachmentKey.self)
-        try attachmentsContainer.allKeys.forEach { attachmentKey in
+        for attachmentKey in attachmentsContainer.allKeys {
             _attachments.append(try attachmentsContainer.decode(File.self, forKey: attachmentKey))
         }
         attachments = _attachments

Sources/Mailgun/Models/MailgunTemplate.swift

@@ -1,4 +1,4 @@
-import Vapor
+public import Vapor
 
 /// Template, see https://documentation.mailgun.com/en/latest/api-templates.html#templates
 public struct MailgunTemplate: Content {