veeso / suppaftp / 27873675394

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feat!: replace async-std runtime with smol (#162)

async-std is unmaintained upstream (RUSTSEC-2025-0052). Drop it as an async
backend and replace it with smol, an equivalent lightweight runtime.

The TLS backends are unchanged: futures-rustls and async-native-tls are
runtime-agnostic, so only the runtime glue (TcpStream/TcpListener, timers,
spawn, task) moved from async-std to smol. async-native-tls already ran on its
runtime-smol backend. The direct futures-lite dependency is gone too: smol
re-exports it and nothing else used it, so it is no longer compiled for
sync/tokio builds.

This commit also centralizes dependencies into [workspace.dependencies], applies
Cargo.toml conventions across all manifests, and renames mod.rs files to the
module_name.rs style.

Migrating from async-std:

- Cargo features: rename every async-std* feature to its smol* counterpart.
  - async-std                            -> smol
  - async-std-async-native-tls           -> smol-async-native-tls
  - async-std-async-native-tls-vendored  -> smol-async-native-tls-vendored
  - async-std-rustls-aws-lc-rs           -> smol-rustls-aws-lc-rs
  - async-std-rustls-ring                -> smol-rustls-ring

- Module path: the async module is now suppaftp::smol instead of
  suppaftp::async_std. The stream type aliases are unchanged: AsyncFtpStream,
  AsyncNativeTlsFtpStream, AsyncRustlsFtpStream.

- Helper types: AsyncStdTlsStream is now SmolTlsStream, and
  AsyncStdPassiveStreamBuilder is now SmolPassiveStreamBuilder.

- Runtime: drive the client on a smol executor (e.g. smol::block_on) instead of
  async_std::task::block_on or #[async_std::main].

Example:

    // before
    use suppaftp::async_std::AsyncFtpStream;
    async_std::task::block_on(async {
        let mut ftp = AsyncFtpStream::connect("127.0.0.1:21").await.unwrap();
    });

    // after
    use suppaftp::smol::AsyncFtpStream;
    smol::block_on(async {
        let mut ftp = AsyncFtpStream::connect("127.0.0.1:21").await.u... (continued)

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