[Outlook integration] part 2 : GetMessages (#9612)

### Introducing

- mock files in order to setup unit test on parsing outlook messages
- special spec files for development purposes : dev.spec files. They are
CI skipped with xdescribe but very useful for iterating on new messages
format
- main functionality : getMessages. We use microsoft default client to
do so, using the $batch endpoint to group calls by 20

### documentation
final touch to add troubleshooting tips

packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-get-messages.service.ts

@@ -2,6 +2,7 @@ import { Injectable } from '@nestjs/common';
 
 import { ConnectedAccountWorkspaceEntity } from 'src/modules/connected-account/standard-objects/connected-account.workspace-entity';
 import { GmailGetMessagesService } from 'src/modules/messaging/message-import-manager/drivers/gmail/services/gmail-get-messages.service';
+import { MicrosoftGetMessagesService } from 'src/modules/messaging/message-import-manager/drivers/microsoft/services/microsoft-get-messages.service';
 import {
   MessageImportException,
   MessageImportExceptionCode,
@@ -14,6 +15,7 @@ export type GetMessagesResponse = MessageWithParticipants[];
 export class MessagingGetMessagesService {
   constructor(
     private readonly gmailGetMessagesService: GmailGetMessagesService,
+    private readonly microsoftGetMessagesService: MicrosoftGetMessagesService,
   ) {}
 
   public async getMessages(
@@ -36,6 +38,12 @@ export class MessagingGetMessagesService {
           connectedAccount,
           workspaceId,
         );
+      case 'microsoft':
+        return this.microsoftGetMessagesService.getMessages(
+          messageIds,
+          connectedAccount,
+          workspaceId,
+        );
       default:
         throw new MessageImportException(
           `Provider ${connectedAccount.provider} is not supported`,