Extend M106/M107 for better laser module support (#16082)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/Configuration_adv.h

@@ -3217,6 +3217,18 @@
   #endif
 #endif
 
+/**
+ * Synchronous Laser Control with M106/M107
+ *
+ * Marlin normally applies M106/M107 fan speeds at a time "soon after" processing
+ * a planner block. This is too inaccurate for a PWM/TTL laser attached to the fan
+ * header (as with some add-on laser kits). Enable this option to set fan/laser
+ * speeds with much more exact timing for improved print fidelity.
+ *
+ * NOTE: This option sacrifices some cooling fan speed options.
+ */
+//#define LASER_SYNCHRONOUS_M106_M107
+
 /**
  * Coolant Control
  *