Fix organization vault export

Since v2022.9.x it seems they changed the export endpoint and way of working.
This PR fixes this by adding the export endpoint.

Also, it looks like the clients can't handle uppercase first JSON key's.
Because of this there now is a function which converts all the key's to lowercase first.

I have an issue reported at Bitwarden if this is expected behavior: https://github.com/bitwarden/clients/issues/3606

Fixes #2760
Fixes #2764