Added technology preview operation 'Update Version'.

Added technology preview operation 'Create Public iTwin Studio App'.

Added technology preview operation 'Get Extensions'.

Added technology preview operation 'Get Private Extensions'.

Added technology preview operation 'Get Private Extension's Versions'.

Added technology preview operation 'Create Private Extension'.

Added technology preview operation 'Delete Private Extension'.

Added technology preview operation 'Create Extension Version'.

Added technology preview operation 'Update Private Extension'.