KarpelesLab / gobzip2 / 23758180890

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Add parallel compression support with benchmarks

Introduce WriterOptions with Concurrency field for optional parallel
block compression. Each block is independently sorted and Huffman-encoded
by a worker goroutine, then serialized in order through a shared bit
stream. Uses bitBuffer type for exact bit-level block output without
byte-alignment padding.

Benchmark results on i9-14900K (1MB data, level 1):
  Single:     12 MB/s
  Parallel/2: 25 MB/s (2.0x)
  Parallel/4: 43 MB/s (3.4x)
  Parallel/N: 53 MB/s (4.2x)

10MB data scales to 109 MB/s with all CPUs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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