Add support to associate instance_groups to an awx_inventory

[srtab]

Hi,

Is it expectable in the near future having support to associate instance_groups to awx_inventory resource? I've checked the code and I didn't find any reference to it.

Here is the associated endpoint os AWX: https://docs.ansible.com/ansible-tower/latest/html/towerapi/api_ref.html#/Inventories/Inventories_inventories_instance_groups_create.

Thanks!