Improve BLTOUCH_HEATERS_OFF functionality

- rename to PROBING_HEATERS_OFF
 - move heater pausing functionality into thermalManager
   - add variables, pause(), ispaused(), other functions
 - add fan pausing functionality -> PROBING_FANS_OFF
 - add probing_pause() wrapper
 - move pausing into do_homing_move() and do_probe_move() to minimize quiet time and so other probe types can benefit
 - example configs

Marlin/Conditionals_post.h

@@ -645,6 +645,15 @@
   #endif
   #define WRITE_FAN_N(n, v) WRITE_FAN##n(v)
 
+
+  /**
+   * Heater & Fan Pausing
+   */
+  #if ENABLED(PROBING_FANS_OFF) && FAN_COUNT == 0
+    #undef PROBING_FANS_OFF
+  #endif
+  #define QUIET_PROBING (ENABLED(PROBING_HEATERS_OFF) || ENABLED(PROBING_FANS_OFF))
+
   /**
    * Servos and probes
    */