[Feature Request] Upgrade PyO3 to latest and use pyo3-async-runtimes instead of pyo3-asyncio

[cretz]

Describe the solution you'd like

https://github.com/PyO3/pyo3-async-runtimes is now available as a successor to https://github.com/awestlake87/pyo3-asyncio, we should try to use it. This also may solve #300.

Note at

sdk-python/temporalio/bridge/src/runtime.rs

Lines 366 to 408 in 92b7758

	// Code below through the rest of the file is similar to
	// https://github.com/awestlake87/pyo3-asyncio/blob/v0.16.0/src/tokio.rs but
	// altered to support spawning based on current Tokio runtime instead of a
	// single static one
	pub(crate) struct TokioRuntime;
	tokio::task_local! {
	static TASK_LOCALS: std::cell::OnceCell<pyo3_asyncio::TaskLocals>;
	}
	impl pyo3_asyncio::generic::Runtime for TokioRuntime {
	type JoinError = tokio::task::JoinError;
	type JoinHandle = tokio::task::JoinHandle<()>;
	fn spawn<F>(fut: F) -> Self::JoinHandle
	where
	F: Future<Output = ()> + Send + 'static,
	{
	tokio::runtime::Handle::current().spawn(fut)
	}
	}
	impl pyo3_asyncio::generic::ContextExt for TokioRuntime {
	fn scope<F, R>(
	locals: pyo3_asyncio::TaskLocals,
	fut: F,
	) -> Pin<Box<dyn Future<Output = R> + Send>>
	where
	F: Future<Output = R> + Send + 'static,
	{
	let cell = std::cell::OnceCell::new();
	cell.set(locals).unwrap();
	Box::pin(TASK_LOCALS.scope(cell, fut))
	}
	fn get_task_locals() -> Option<pyo3_asyncio::TaskLocals> {
	TASK_LOCALS
	.try_with(|c| c.get().cloned())
	.unwrap_or_default()
	}
	}

we had to copy over some pyo3-asyncio code because it only supported a spawning from a global Tokio runtime and we needed to spawn from the current one. Make sure that pyo3-async-runtimes can handle this properly.

[cretz]

See https://community.temporal.io/t/support-for-graalpy/17029 for context on why this was created. Also see related issue at oracle/graalpython#494 that encouraged this to be opened.