support --ids

[RodgeFu]

Azure/azure-cli-extensions#1428 (comment)

[fengzhou-msft]

Just to clarify, --ids is not needed for create/list commands, it's needed for update/show/delete (probably also wait) commands and potentially other commands that is targeting the operations on a single existing main resource of the command.

We can start with supporting configuring id_part in readme, which should be quick to add. Adding it automatically in generated code may be complicated. You can make use of the parse_resource_id method in msrestazure if possible. All the available id_part is commented here.