Outlook Addin - shared mailboxes support improvement

1. Please add ability to read from which shared mailbox message came from when getting messages by getSelectedItemsAsync. Currently, it's not available.

2.  ItemId from SelectedItemDetails is invalid when item comes from shared mailbox. It is not possible to get email by this id through Graph API. I had to bypass this by using filtering by internetMessageId.

https://stackoverflow.com/questions/77220976/graph-api-reading-message-from-shared-mailbox-with-only-message-id-without-ma/