VFS implementation for zip archives

Add zip implementation of the VFS interface introduced in !324 (merged) and !325 (merged).

Depends on #446 (closed) and #448 (closed).

• Add a zip package that opens archives using http_range - source !326 (diffs)
• Implement the VFS interface - source !326 (diffs)
• Update metrics acceptance tests for TestPrometheusMetricsCanBeScraped