Add Danbooru::Archive library for handling .zip and .rar files.

Introduce a new Danbooru::Archive library. This is a wrapper around libarchive that lets us extract
.zip, .rar, .7z, and other archive formats. Replace the rubyzip library in MediaFile::Ugoira with
the new Danbooru::Archive library.

This is a step towards fixing #5340: Add support for extracting archive attachments from certain sources.

This adds a new dependency on libarchive. Downstream users should `apt-get install libarchive13` if
they're not using Docker.

https://github.com/chef/ffi-libarchive
https://github.com/libarchive/libarchive
https://www.rubydoc.info/gems/ffi-libarchive/0.4.2
https://github.com/libarchive/libarchive/wiki/Examples#a-complete-extractor

Gemfile

@@ -9,7 +9,6 @@ gem "sanitize"
 gem 'ruby-vips'
 gem 'diff-lcs', :require => "diff/lcs/array"
 gem 'bcrypt', :require => "bcrypt"
-gem 'rubyzip', :require => "zip"
 gem 'stripe'
 gem 'aws-sdk-sqs', '~> 1'
 gem 'responders'
@@ -59,6 +58,7 @@ gem "ffaker"
 gem "composite_primary_keys"
 gem "resolv"
 gem "rover-df"
+gem "ffi-libarchive"
 
 group :development do
   gem 'rubocop', require: false