[PS-2096] BEEEEP: Add Psono importer (#4286)

* Add psono json importer

Create types for psono export format
Add test files
Write tests for psono-json-importer
Write importer for psono export
Register 'psonojson' with `importOptions`
Import/register psono-json-importer with import.service
Add instructions on how to export from Psono

* Retain all imported data

Ensure all data is retained by adding unmapped properties into custom fields
Each item type has a set of mapped properties, anything not matching will be created as a custom field
Write extensive tests to ensure data is present

* Skipping GPG

We currently cannot import GPG Keys into notes or custom fields

* Add organizational test

Verify that folders get converted to collections when imported by an org

* Remove combined test-file (whole export)

* Remove redundant null type

libs/common/src/enums/importOptions.ts

@@ -67,6 +67,7 @@ export const regularImportOptions = [
   { id: "encryptrcsv", name: "Encryptr (csv)" },
   { id: "yoticsv", name: "Yoti (csv)" },
   { id: "nordpasscsv", name: "Nordpass (csv)" },
+  { id: "psonojson", name: "Psono (json)" },
   { id: "passkyjson", name: "Passky (json)" },
 ] as const;