OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_ENABLE macro

@def OPENTHREAD_CONFIG_TMF_ANYCAST_LOCATOR_ENABLE Define to 1 to enable TMF anycast locator functionality. This feature allows a device to determine the mesh local EID and RLOC16 of the closest destination of an anycast address (if any) through sending `TMF_ANYCAST_LOCATE` requests.