improvement on list/listAsync of webapp/functionapp

[weidongxu-microsoft]

Fix #1113

1. sync/async should behave same
2. document that list would make extra calls
3. devise lite version of the list to only return basic info of webapp/functionapp, provide a e.g. refresh to get full info

still in developing

[weidongxu-microsoft]

Try to add a IWebAppSimple for simple list that does not involve sending GET for each resource.

[weidongxu-microsoft]

@ChenTanyi @xccc-msft @yungezz please take a look whether this make sense.

Previous List send 1 list, then n*2 get, which is not a good design.
Currently add a ListBasic that only send 1 list, and get basic info. If detail is needed, do a separate GetById.

For Java track2, plan is to use this ListBasic as the standard List (for that, we can do breaking changes).

[weidongxu-microsoft]

Fix #1120

Include kind=api in list result for WebApp.