Implement interrupt handling for long-running commands and archive extraction

- Added an `interrupts` module to manage Ctrl-C signals and propagate them to child processes.
- Refactored archive extraction functions to check for interrupts and handle them gracefully.
- Introduced `copy_interruptibly` function to allow for interruptible copying of data.
- Updated various source files to utilize the new interrupt handling functions, ensuring that commands and archive extractions can be interrupted by the user.
- Added tests to verify the interrupt functionality during copying and tar extraction.
- Introduced a new Meson option for generating HTML CLI documentation.
- Enhanced the `PackageSpec` struct to support additional Rust LTO flags.

src/builder/custom.rs

@@ -131,7 +131,7 @@ pub fn build(
         crate::builder::prepare_tool_command(&mut cmd, &env_vars);
 
         // Run the command and include the OS error on spawn failures for clearer diagnostics
-        let status = cmd.status().map_err(|e| {
+        let status = crate::interrupts::command_status(&mut cmd).map_err(|e| {
             anyhow::anyhow!(
                 "Failed to run build script {}: {}",
                 build_script.display(),