Extract tuple_hash() into a separate file

src/box/CMakeLists.txt

src/box/key_def.cc

src/box/memtx_hash.cc

src/box/tuple_compare.cc

src/box/tuple_compare.h

src/box/tuple_hash.cc

src/box/tuple_hash.h

src/box/vinyl.c

src/box/vy_run.c