Add min_y and max_y checks for Active Block Modifiers (ABM) (#11333)

This check can be used by ABM to reduce CPU usage.

doc/lua_api.txt

@@ -4484,6 +4484,8 @@ Utilities
           -- degrotate param2 rotates in units of 1.5° instead of 2°
           -- thus changing the range of values from 0-179 to 0-240 (5.5.0)
           degrotate_240_steps = true,
+          -- ABM supports min_y and max_y fields in definition (5.5.0)
+          abm_min_max_y = true,
       }
 
 * `minetest.has_feature(arg)`: returns `boolean, missing_features`
@@ -7187,6 +7189,11 @@ Used by `minetest.register_abm`.
         chance = 1,
         -- Chance of triggering `action` per-node per-interval is 1.0 / this
         -- value
+        
+        min_y = -32768,
+        max_y = 32767,
+        -- min and max height levels where ABM will be processed
+        -- can be used to reduce CPU usage
 
         catch_up = true,
         -- If true, catch-up behaviour is enabled: The `chance` value is