feat(clients): professional clients with tests, CI/CD, and examples

- Python: pyproject.toml, pytest suite (unit + integration), README, examples
- JavaScript: package.json, TypeScript definitions, node:test suite, README, examples
- Nim: integration tests, examples, README, improved nimble tasks
- Rust: fixed nodelay/localhost IPv6 bug, integration tests, examples, README
- Added GitHub Actions CI for all 4 clients against Docker server
- Added docker-compose.test.yml for local integration testing
- Added .gitignore for each client

clients/rust/src/lib.rs

@@ -242,6 +242,7 @@ impl Client {
     pub fn connect_with_config(config: Config) -> Result<Self, Box<dyn std::error::Error>> {
         let addr = format!("{}:{}", config.host, config.port);
         let stream = TcpStream::connect(&addr)?;
+        stream.set_nodelay(true)?;
         Ok(Client {
             config,
             stream,