Removing bzip2 support from apt due to rustification

[Julian Andres Klode <jak@debian.org>]

Hi folks,

seeing that Federico Mena Quintero has taken over bzip2 development
and is in the process of porting it to Rust[1], we should consider
removing bzip2 support from apt, dpkg, etc. following the release
of buster.

My understanding is that having APT depend on a library written in
Rust severily hurts its portability, and makes it hard to support
for stable releases, as Rust is a fairly fast moving target.

I do not believe that bzip2 is a useful algorithm in todays world,
and we should look at migrating any remaining bzip2-only things
(translation files I think) to xz or zstd.

Thanks,
Julian

[1] https://people.gnome.org/~federico/blog/maintaining-bzip2.html
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