Remove protective copies in Thrift APIs

[ctubbsii]

Generate thrift with unsafe_binaries flag to remove unwanted protective copies of ByteBuffer types (we will copy as needed ourselves).

[ctubbsii]

There are a few other options we may want to look at for performance, too. In particular, the option_type=jdk8 (which I intend to do in a subsequent PR), the future_iface (which may be interesting to use), and the reuse_objects (which might require turning back on the protective copies in the APIs) options.

thrift -help 2>&1 | sed -n '/^\s\sjava\s/,/^\s\s\w/p'