asyncs is a shim like package to ship async runtime agnostic facilities.

• cargo add asyncs for libraries.
• cargo add --dev --features test asyncs for tests.
• cargo add --features tokio,smol,async-global-executor for binaries to compat with existing async runtimes. See spawns for more.

Feature test should only be enabled for dev-dependencies.

• asyncs::task::spawn to spawn tasks in runtime agnostic way from spawns.
• select! to multiplex asynchronous futures simultaneously from async-select.
• #[asyncs::test] to bootstrap a runtime for testing. This is only available with feature test.

Executors and #[asyncs::main].