Use static, per-thread buffers for (de)serialization

Notes:
* TimedValue was turned to mutable object to leverage on re-suing
  objects and furthere reduce the memory footprint (see [1])
* serialization of 'created' and 'length' happens through bytes array
  ('out.write(buffer.array());') therefore deserialization has to be
  performed in the same way and per-thread read/write buffer (which is
  bytes array) was added

[1] Read interface documentation excerpt:
(...) should attempt to reuse the given using object, i. e. to read
the deserialized data into the given object. If it is possible, this
object then returned from this method back. If it is impossible for
any reason, a new object should be created and returned (...)

Change-Id: I89871476f8186d4f5d2bceef34276b4f5756b181