added doneCallback to track completion of async operation

[greatramu]

Added doneCallback after the cancelCallback to help user track the completion of async operations.

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[jwngr]

Thanks for the PR! What are you trying to accomplish with this API? As is, the doneCallback() you provide is going to be called a bunch of times and I don't think it will really do what you want it to. Are you maybe trying to figure out when the initial data has loaded? If so, I would suggest checking out this Stack Overflow post.

[posva]

Hey @greatramu thanks a lot for the PR. As @jwngr pointed out, this is not the right way to go.
I have plans to add this feature as it makes SSR easier. I still want to do some testing though
I'll open an issue so you can subscribe to it and keep track of it 😉