refactor: rename instance.instance_uuid -> instance.uuid

picoplugin/src/internal/types.rs

src/config.rs

src/info.rs

src/instance.rs

src/lib.rs

src/luamod.rs

src/plugin/ffi.rs

src/rpc/join.rs

src/tarantool.rs

src/vshard.rs

test/conftest.py

test/int/test_basics.py

test/int/test_joining.py

test/int/test_plugin.py

test/int/test_sql.py

test/testplug/src/lib.rs