Upgrade SharpCompress to 0.47.4 and migrate extractor APIs to new OpenReader/OpenArchive surface

[Copilot]

SharpCompress 0.47.4 introduces breaking API changes (Open replacements and interface-based archive returns). This PR updates RecursiveExtractor to the new API surface while preserving existing extraction behavior across supported archive types.

• Dependency update

  • Bumped SharpCompress from 0.44.5 to 0.47.4 in RecursiveExtractor.csproj.

• Reader API migration (forward readers)

  • Updated reader-based extractors to use OpenReader(...):
    • AceReader, ArcReader, ArjReader
  • Updated ZIP forward scan path to use ReaderFactory.OpenReader(...) (non-indexed entry discovery path).

• Archive API migration (archive model)

  • Updated archive-based extractors to use OpenArchive(...):
    • ZipArchive, TarArchive, RarArchive, SevenZipArchive
  • Adjusted call sites to handle the new interface-returning methods with concrete-type casting where needed by existing code paths.

• BZip2 API migration

  • Replaced removed constructor usage with BZip2Stream.Create(...) in sync and async flows.

// Before
zipArchive = ZipArchive.Open(fileEntry.Content, new ReaderOptions { LeaveStreamOpen = true });

// After
zipArchive = (ZipArchive)ZipArchive.OpenArchive(
    fileEntry.Content,
    new ReaderOptions { LeaveStreamOpen = true });