[PM-12598] Create dedicated importer for Password-XP (csv) (#11751)

* Create dedicated password-xp csv importer

* Add support for importing unmapped columns as custom fields

* Add support for importing folders and assiging items to them

* On import into an organization, convert folders to collections

* Register importer within importService and make it selectable via the UI

Add instructions on how to export from Password XP

* Mark method as private

* Add docs

* Add comment around folder detection

* Move test data into separate file

---------

Co-authored-by: Daniel James Smith <djsmith85@users.noreply.github.com>
Co-authored-by: Matt Bishop <mbishop@bitwarden.com>

libs/importer/src/services/import.service.ts

@@ -84,6 +84,7 @@ import {
   UpmCsvImporter,
   YotiCsvImporter,
   ZohoVaultCsvImporter,
+  PasswordXPCsvImporter,
 } from "../importers";
 import { Importer } from "../importers/importer";
 import {
@@ -336,6 +337,8 @@ export class ImportService implements ImportServiceAbstraction {
         return new PasskyJsonImporter();
       case "protonpass":
         return new ProtonPassJsonImporter(this.i18nService);
+      case "passwordxpcsv":
+        return new PasswordXPCsvImporter();
       case "netwrixpasswordsecure":
         return new NetwrixPasswordSecureCsvImporter();
       default: