Bubbles API council feedback

* un-deprecate getIntent/getIcon/setIntent/setIcon
* deprecate createIntentBubble & createShortcutBubble and make them
  constructor methods & deprecate existing constructor
* clarify when intent / icon / shortcut id will be null or not
* use NPE instead of illegal argument exception
* use illegal state exception when using setIcon/setIntent on a builder
  created with shortcut method

* updates usages of getBubbleIntent/getBubbleIcon to be getIntent/getIcon
* updates builder constructor usages as well

Fixes: 149911930
Test: treehugger
Change-Id: Ic85a475d463cb22cea7d7939fea4cf72465491b4