There is no specific Apollo3 library for the SparkFun_VL53L5CX as the standard library works on the different boards. The library (version 1.0.3) can be obtained in 2 ways:
In the ArduinoIDE: Tools → Manage libraries → search for SparkFun_VL53L5CX.
On the webpage you referenced: “Software Setup and Programming” ->SPARKFUN QWIIC TIME-OF-FLIGHT SENSOR VL53L5CX ARDUINO LIBRARY (ZIP).
Once downloaded you can include that in the ArduinoIDE: sketch-> Include Library → add .ZIP library