Changes to Add Member To User Group

api operation id Add_member_to_user_group_v1_workspace_groups__group_id__members_post removed and replaced with add_member

the header request parameter xi-api-key became optional

header request parameter xi-api-key list-of-types was widened by adding types null

for the header request parameter xi-api-key, the type was generalized from string to no type

endpoint added