v1.21.1

Summary

• Add string abbreviation size option for Deno.inspect and compact empty iterable handling in console;
• Introduce HTTP auto-response body compression, fast‑path for uncompressed bodies, better compressibility checks, and streaming body optimizations;
• Fix numerous issues across benchmarks, CLI, testing, workers, spawn, watcher, and UI colors, plus performance boosts for file reads and V8 ser/de zero‑copy.