Add tracking of allocated arrays.

The BigArrays utility class is useful to generate arrays of various sizes: when
small, arrays will be allocated directly on the heap while larger arrays are
going to be paged and to recycle pages through PageCacheRecycler. We already
have tracking for pages but this is not triggered very often since it only
happens on large amounts of data while our tests work on small amounts of data
in order to be fast.

Tracking arrays directly helps make sure that we never forget to release them.

This pull request also improves testing by:

 - putting random content in the arrays upon release: this makes sure that
   consumers don't use these arrays anymore when they are released as their
   content may be subject to use for another purpose since pages are recycled

 - putting random content in the arrays upon creation and resize when
   `clearOnResize` is `false`.

The major difference with `master` is that the `BigArrays` class is now
instanciable, injected via Guice and usually available through the
`SearchContext`. This way, it can be mocked for tests.