Deprecation warning for apt and moving to deb822

[l00d3r]

This role currently installs old ONE-LINE-STYLE FORMAT style repo definition on Debian based systems and apt update gives the following message:

W: https://repo.powerdns.com/ubuntu/dists/jammy-rec-52/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

I suggest this role moves to the new deb822 format and place signing keys to /etc/apt/keyrings as noted in the manpage DEPRECATION section.

Also this role creates a new file for each new version of powerdns recursor and when updating it leaves the old versions repo file lying around, I suggest we use a single file like pdns-rec.sources so the /etc/apt/sources.list.d/ folder is not cluttered with old pdns-rec-${version}.list files.

[SrX]

Addressed in #225.