* Initial testing for deb822 APT sources

* Added defined type for generating deb822 apt sources

Should be roughly drop-in alternative to the existing apt::source type
Does not currently support inline ascii gpg key

* Add puppet strings documentation

* Replace example with generic content

* Initial testing of apt::source with deb822 support

* Fix setting_type and signed_by

Use 'sources' instead of 'source' as the setting_type parsed to
apt::setting

Fix the data type of apt::source::signed_by

* Fix source_deb822.epp template

Correctly handle newline/whitespace trimming for `signed_by` parameter.

* Remove link from components to repos

* Add logic for deb822 sources

* Update documentation for deb822 sources

* Update source_format parameter

Match the possible values to the file suffix of the created source
files.

* Add forward-compatibility with deb822

Allow array values for certain parameters to allow easy switching between .list and .sources formats.

* Add backward-compatibility for deb822 sources

Convert string values to arrays where possible and warn the user.

* Fix logic

* Revert "Add forward-compatibility with deb822"

This reverts commit 9d88e9392b816e6996998370ecc29a7f1a3dd9bb.

* Fix deb822 backward compatibility

Correctly compare data type when generating deb822 sources
Remove unused class parameters and descriptions

* Update puppet-strings and logic

Remove references to unused deb822 parameters
Update parameter descriptions
Update deb822 example
Update warnings for $pin and $key usage with deb822. Currently
unsupported
Don't fail if $location is missing unless $ensure is 'present'

* Remove unused spec test

* Add unit testing for deb822 sources

* Update README.md with deb822 sources example

* Fix unit test syntax

* Re-apply commit 2faa817d

eliminate params.pp and create_resources()

params.pp and create_resources() are obsolete.

This module was converted to non-params.pp style #667, but was
reverted in #680. Using Hiera in modules and no params.pp are the
preferred styles these days.

* Update apt::config_files hash

Add support for deb822 .sources files

* Update data types and documentation

Re-apply data-type changes for apt::source::pin from 1e1baadf
Regenerate puppet strings to match.

* Update source_deb822.epp template

Remove leading whitespace

* Update manifests/setting.pp

Simplify apt::setting logic

Co-authored-by: Tim Meusel <tim@bastelfreak.de>

---------

Co-authored-by: James Paton-Smith <jamesps@ebi.ac.uk>
Co-authored-by: Tim Meusel <tim@bastelfreak.de>