Nullable/Try variant for picker methods like ShowDirectoryPickerAsync?

[datvm]

Currently methods like ShowDirectoryPickerAsync return a non-nullable object and throw when the user cancels. It's quite awkward to use:

        FileSystemDirectoryHandleInProcess folder;
        try
        {
            folder = await Fs.ShowDirectoryPickerAsync(new DirectoryPickerOptions()
            {
                Mode = FileSystemPermissionMode.ReadWrite,
                Id = "id",
            });
        }
        catch (JSException ex) when (ex.Message.Contains("AbortError"))
        {
            return; // When cancel
        }
        // Use folder here

I understand it would be breaking change to make it nullable, so we can either add a method to the services directly or write extension methods for them. Suggestion:

static async<T?> TryShowAsync<T>(Func<Task<T>> action); // Common wrapper to be reused for all picker methods.
public async<FileSystemDirectoryHandleInProcess> TryShowDirectoryPickerAsync() => await TryShowAsync(async() => Fs.ShowDirectoryPickerAsync());
// ...

I am happy to make a PR if you agree and choose the preferred way to implement it.