v0.14.0

• Add serve subcommand for serving crate registry with sparse index, downloads, and search support.
• Add --crate option to mirror specific crates without a Cargo.toml (e.g. --crate reqwest@0.12.8)
• Add --get-feature-gated to extract and grab all depends for each crate, ignoring enabled features.
  This is enabled by default for -crate.
• Add progress bars for downloads and processing, with --verbose flag for line-by-line output
• Compute subcommand update-index crates in parallel