Currently, the spo site set command allows only for setting a handful of options. We should extend it to match the options available in spo site add as much as possible. This will be not only beneficial for our users but also to implement the spo site ensure command described in #1404.

• title
• description doesn't seem to be possible
• classification
• isPublic
• allowFileSharingForGuestUsers is deprecated
• owners
• shareByEmailEnabled
• siteDesign you can't apply one of the standard site designs by name afterwards
• siteDesignId
• tests
• docs