v0.4.0

• Minimize contract wasm binary size:
  • Run wasm-opt.
  • Uses cargo-xbuild to build custom sysroot crates without panic string
    bloat.
  • Automatically removes the rlib crate type from Cargo.toml, removing redundant metadata.
• Removes requirement for linker args specified in .cargo/config.
• Added --verbose and --quiet flags for build and generate-metadata commands.