api documentation (#876)

* api documentation

* utoipa openapi docs generator

---------

Co-authored-by: Andrej Walilko <awalilko@liquidweb.com>

daemon/src/bin/gen_api.rs

@@ -0,0 +1,12 @@
+use std::{env, fs};
+
+fn main() {
+    let content = rayhunter_daemon::ApiDocs::generate();
+    let mut filename = "openapi.json".to_string();
+    let args: Vec<String> = env::args().collect();
+    if args.len() > 1 {
+        filename = args[1].to_string();
+    }
+
+    fs::write(filename, content).unwrap();
+}