Better change feed support

[christopheranderson]

Right now you have to know how to set the options on items.readAll() in order to get change feed type support. We should support the ChangeFeedQuery type of format that .NET has (https://docs.microsoft.com/en-us/azure/cosmos-db/change-feed#using-the-sdk)

We should also evaluate creating the equivalent of the ChangeFeedProcessorHost that .NET has to make the experience even easier.

Related issues: #265

[Marsup]

Hi @christopheranderson, in the meantime I have some troubles finding any resources about how to set the options on items.readAll(), do you have any snippet to share to understand how it could be done with present SDK? I set a_im but that's probably not enough, right ?

[christopheranderson]

This is the current best sample I have for this: https://github.com/Azure/azure-cosmos-js/blob/master/src/test/integration/incrementalFeed.spec.ts#L41

I might spend some time on this later this week. I'm trying to clean up a lot of docs/etc. this week, which mainly means a lot more samples.

[christopheranderson]

Change feed feature issue created here: Azure/azure-sdk-for-js#4808

Closing this issue as the other points have been resolved