perf($parse): only execute watched expressions when the inputs change

With this change, expressions like "firstName + ' ' + lastName | uppercase"
will be analyzed and only the inputs for the expression will be watched
(in this case "firstName" and "lastName"). Only when at least one of the inputs
change, the expression will be evaluated.

This change speeds up simple expressions like `firstName | noop` by ~15%
and more complex expressions like `startDate | date` by ~2500%.

BREAKING CHANGE: all filters are assumed to be stateless functions

Previously it was a good practice to make all filters stateless, but now
it's a requirement in order for the model change-observation to pick up
all changes.

If an existing filter is statefull, it can be flagged as such but keep in
mind that this will result in a significant performance-penalty that will
affect the $digest duration.

To flag a filter as stateful do the following:

myApp.filter('myFilter', function() {
  function myFilter(input) { ... };
  myFilter.$stateful = true;
  return myFilter;
});

Closes #9006
Closes #9082
refactor($parse): name anonymous fns for easier debugging and profiling
refactor($parse): merge ternary and ternaryFn methods

splitting the code into two chunks doesn't buy us anything and only makes the code harder to follow