support of CLI option groups #172
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What this PR does / why we need it:
The add commands have lots of options because of the possibility to specify resources directly via options.
By default options are shown ordered in the command help.
It would be useful to be able to show the options grouped by their meaning, options for specifying the access, options for specifying local input and options specifying the resource meta data.
This PR provides a pflag extension to use flag annotations to specify option groups together with some utility functions to provide appropriately formatted Usage output.
Additionally the OptionTypeSet feature is extended to add group information.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Release note: