API: Surface all remote config options

The pulp_ansible API offers a number of configuration options that are not exposed in the galaxy_ng UI, but should be. These include the following:

• username
• password
• proxy_url
• tls_validation
• client_key
• client_cert
• ca_cert

For details view: https://pulp-ansible.readthedocs.io/en/latest/restapi.html#operation/remotes_ansible_collection_create