Expose version info in CLI tool with build-time obtained git hash (#787)

* version info with built-time obtained git hash

* clippy

* rerun-if-changed properly and handle git command failing

* cargo fmt

cli/src/commands/mod.rs

@@ -5,3 +5,4 @@
 pub mod codegen;
 pub mod compatibility;
 pub mod metadata;
+pub mod version;

cli/src/commands/version.rs

@@ -0,0 +1,16 @@
+use clap::Parser as ClapParser;
+
+/// Prints version information
+#[derive(Debug, ClapParser)]
+pub struct Opts {}
+
+pub fn run(_opts: Opts) -> color_eyre::Result<()> {
+    let git_hash = env!("GIT_HASH");
+    println!(
+        "{} {}-{}",
+        clap::crate_name!(),
+        clap::crate_version!(),
+        git_hash
+    );
+    Ok(())
+}