* Add type filtering to dump command (Issue #52)

Added -t / --type option to the dump command. Accepts both numeric
ClassID (-t 114) and type name (-t MonoBehaviour), case-insensitive.
Resolved via TypeIdRegistry for built-in types, falls back to TypeTree
root node for script types. Combines with -i as AND logic.

Added "Filtering by Type" walkthrough in command-dump.md focused on the
MonoBehaviour use case. Updated parameter docs in textdumper.md.

Tests for name filter, numeric filter and no-match output.

Made-with: Cursor

Adds new archive inspection subcommands, self-contained archive metadata parsing, JSON output support, and C# wrappers for recently added UnityFileSystemApi functions.

New archive subcommands: info, header, blocks
Improved archive list with offsets
Archive command supports JSON output via -f Json.
archive extract supports --filter option

Self-contained archive metadata parsing

Extracted all WebBundle-specific code from Archive.cs into a dedicated WebBundleHelper class.

Update to UnityFileSystemApi C# wrappers
Added P/Invoke declarations and public wrappers for 7 new native API functions
(this is exposes TypeTree info that may be used in future PRs)

- Windows builds: exclude macOS (.dylib) and Linux (.so) native libraries
- macOS builds: exclude Windows (UnityFileSystemApi.dll) and Linux (.so) native libraries
- Also exclude .pdb files from release artifacts

Update the unity-content-format document to cross reference with the more powerful archive and serialized-file commands.