##### SUMMARY

When I run `ansible-galaxy [type] init`, I would like to be able to use my own configured 'skeleton' to init that content.

For Ansible roles, when running `ansible-galaxy role init myrole`, I can configure a [`GALAXY_ROLE_SKELETON`](https://docs.ansible.com/ansible/latest/reference_appendices/config.html#galaxy-role-skeleton) in my `ansible.cfg`, and the init command will use that skeleton as the source for the new role.

For Ansible collections, currently there's a bug (https://github.com/ansible/ansible/issues/66255) that causes collections to use that skeleton if its set (which can lead to some confusion)—but once that bug's fixed, there's no way to specify a skeleton for a collection.

So this feature request is to add a new configuration option `GALAXY_COLLECTION_SKELETON` (environment variable `ANSIBLE_GALAXY_COLLECTION_SKELETON`) which allows a collection skeleton to be specified.

Note: the docs for `GALAXY_ROLE_SKELETON` currently state:

> Role or collection skeleton directory to use as a template for the `init` action in `ansible-galaxy`, same as `--role-skeleton`.

Therefore that would need adjusting too, if the previously mentioned bug doesn't fix that.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME

ansible-galaxy init

##### ADDITIONAL INFORMATION

N/A
requirements_file = GalaxyCLI._resolve_path(requirements_file)
        two_type_warning = "The requirements file '%s' contains {0}s which will be ignored. To install these {0}s " \
                           "run 'ansible-galaxy {0} install -r' or to install both at the same time run " \
                           "'ansible-galaxy install -r' without a custom install path." % to_text(requirements_file)
        
        collection_requirements = []
        role_requirements = []
        if context.CLIARGS['type'] == 'collection':
            collection_path = GalaxyCLI._resolve_path(context.CLIARGS['collections_path'])
            requirements = self._require_one_of_collections_requirements(
                install_items, requirements_file,
                artifacts_manager=artifacts_manager,
            )
            collection_requirements = requirements['collections']
            if requirements['roles']:
                display.vvv(two_type_warning.format('role'))
        else:
            if not install_items and requirements_file is None:
                raise AnsibleOptionsError("- you must specify a user/role name or a roles file")
            if requirements_file:
                if not (requirements_file.endswith('.yaml') or requirements_file.endswith('.yml')):
                    raise AnsibleError("Invalid role requirements file, it must end with a .yml or .yaml extension")
                requirements = self._parse_requirements_file(
                    requirements_file,
                    artifacts_manager=artifacts_manager,
                )
                role_requirements = requirements['roles']
                
                
                galaxy_args = self._raw_args