Move tuple validation to tuple.cc

src/box/alter.cc

src/box/errcode.h

src/box/key_def.h

src/box/lua/space.cc

src/box/memtx_engine.cc

src/box/space.cc

src/box/space.h

src/box/tuple.cc

src/box/tuple_format.cc

src/box/tuple_format.h

src/box/vinyl_space.cc

test/box/alter_limits.result

test/box/misc.result

test/engine/upsert.result

test/engine/upsert.test.lua