Rename `mjPLUGIN_DYNAMIC_LIBRARY_INIT` -> `mjPLUGIN_LIB_INIT`. PiperOrigin-RevId: 521458377 Change-Id: I42aaec923e4f392899dfe53ab6ce1dddc75a83b3
PiperOrigin-RevId: 491340247 Change-Id: If559d60371ad604b94b92efd01ed6de9ecf6f2b0