Async initialization of a client

[verdie-g]

In some cases, a client is lazily initialized when we need, making the initialization in the hot path of a request. It would be great in that case no threads were blocked to avoid impacting the throughput of the thread pool.

Could we have an API like this one

AsyncClient client = new(/* ... */);
await client.StartAsync();

or safer

AsyncClient client = await AsyncClient.CreateAsync(/* ... */)

[shannonklaus]

Yes, we can have an API like this in the async awaitable client. Thanks for bringing this to my attention.