ci: add GitHub Actions workflows with semantic-release auto-versioning

chore: fix all 702 clippy warnings across codebase
- auto-fix 475 via cargo clippy --fix
- fix remaining 227 manually: uninlined_format_args, redundant_closure, match_same_arms,
  underscore_binding, format_push_string, items_after_statements, needless_pass_by_value,
  clone_on_copy, case_sensitive_extension, single_match/let-else, write_with_newline,
  and other clippy lints

src/tool/utility/pong.rs

@@ -39,6 +39,6 @@ impl Tool for Pong {
         let msg = args.get("message")
             .and_then(|v| v.as_str())
             .unwrap_or("pong");
-        Ok(format!("pong: {}", msg))
+        Ok(format!("pong: {msg}"))
     }
 }