A library that lets you wrap and await any awaitable object in C#.

NOTE: This library is slower than direct await about 10~12 times, this will cause a huge performance impact when sensitive to async/await performance .

object obj = ...;
await AwaitableWrapper.Wrap(obj);

object obj = Task.FromResult(1);
int result = await AwaitableWrapper.Wrap<int>(obj);

1. Check object type, throw if incoming object is not awaitable.
2. Call 'GetAwaiter' method and box return value to object.
3. Wrap, generate and cache OnComplete,get_IsCompleted,GetResult from the awaiter which returned from GetAwaiter method.
4. Create AwaiterWrapper object and pass cached methods to it.

| Method                       | Mean       | Error     | StdDev    |
|----------------------------- |-----------:|----------:|----------:|
| DirectAwaitTask              |   9.996 ns | 0.0746 ns | 0.0661 ns |
| WrappedTask                  | 101.225 ns | 2.0640 ns | 2.1196 ns |
| DirectAwaitValueTask         |   9.233 ns | 0.0876 ns | 0.0732 ns |
| WrappedValueTask             | 111.555 ns | 2.1622 ns | 2.1236 ns |