Description of problem:

Katello's API documentation doesn't expose paging in /katello/api/activation_keys/:id/product_content [1]. This limits the theforeman.foreman.activation_key Ansible module [2] to a maximum of 20 products - in case you have more, the module doesn't know about all products and is no longer idempotent. The same is true for hammer, it shows about additional pages, but doesn't accept to page or increase the page size. This becomes painful when creating keys for Library, Organization View on a Red Hat Satellite with Simple Content Access enabled.

[1] https://theforeman.org/plugins/katello/3.17/api/apidoc/v2/activation_keys/product_content.html
[2] https://docs.ansible.com/ansible/latest/collections/theforeman/foreman/activation_key_module.html

From my understanding it's sufficient to announce the per_page and page parameters in the API documentation to make apypie aware of the parameters. I'm not sure if hammer needs special treating.

Version-Release number of selected component (if applicable):

Red Hat Satellite >= 6.12

How reproducible:

always

Steps to Reproduce:
1. Make sure the Satellite has more then 20 active Red Hat repositories
2. Create an ActivationKey following the example in https://docs.ansible.com/ansible/latest/collections/theforeman/foreman/activation_key_module.html
3. Rerun the Ansible play

Actual results:

The module isn't idempotent since it is not capable of fetching more then 20 product entries from the existing ActivationKey

Expected results:

The module fetches all product entries and is idempotent

Additional info:

The same issue exists in hammer:

# hammer -d activation-key product-content --id=1 --organization=Default --content-access-mode-all true --content-access-mode-env false

-----|-----------------------------------------------------------------------|------------------------------------------|------------------|----------
ID   | NAME                                                                  | LABEL                                    | DEFAULT ENABLED? | OVERRIDE 
-----|-----------------------------------------------------------------------|------------------------------------------|------------------|----------
4822 | Red Hat Enterprise Linux 7 Server (Kickstart)                         | rhel-7-server-kickstart                  | no               |          
4848 | Red Hat Enterprise Linux 7 Server (RPMs)                              | rhel-7-server-rpms                       | yes              | enabled:0
3015 | Red Hat Enterprise Linux 8 for x86_64 - AppStream (Kickstart)         | rhel-8-for-x86_64-appstream-kickstart    | no               |          
-----|-----------------------------------------------------------------------|------------------------------------------|------------------|----------
Page 1 of 2 (use --page and --per-page for navigation).