This is a step toward effectively eliminating reference counting.
Reference counting is only needed when the memory in buffers can be shared.
If we remove all forms of sharing, then the buffers would be in an owned state at all times.
Then we would no longer need to worry about the state of the buffers before calling, e.g. `ensureWritable` and methods like that.
Just removing `acquire` is not enough; we also need to remove the `slice` method.
In this commit we are, however, starting with `acquire` because doing so requires rearranging the type hierarchy and the generics we have in play.
This was not an easy exercise, but for the purpose of record keeping, it's useful to have that work separate from the work of removing `slice`.
… by lazily allocating PoolSubpages inside of the PoolArenas.
By default, a pooled allocator creates 32 arenas, and each arena, by default, makes room for 39 PoolSubpage size classes, which all told is 1.248 objects that serve no purpose other than as headers and locks for linked lists.
Each of these objects is at least 81 bytes, plus whatever the JVM adds on top.
This might not sound like much, but in our testing we'll be creating many thousands of allocators, and then it really adds up.
