Add more garbage collector functions

src/zigluau/lib.zig

@@ -384,6 +384,18 @@ pub const Lua = struct {
         return c.lua_gc(lua.state, c.LUA_GCSETSTEPMUL, multiplier);
     }
 
+    pub fn gcIsRunning(lua: *Lua) bool {
+        return c.lua_gc(lua.state, c.LUA_GCISRUNNING, 0) == 1;
+    }
+
+    pub fn gcSetGoal(lua: *Lua, goal: i32) i32 {
+        return c.lua_gc(lua.state, c.LUA_GCSETGOAL, goal);
+    }
+
+    pub fn gcSetStepSize(lua: *Lua, size: i32) i32 {
+        return c.lua_gc(lua.state, c.LUA_GCSETSTEPSIZE, size);
+    }
+
     /// Returns the memory allocation function of a given state
     /// If data is not null, it is set to the opaque pointer given when the allocator function was set
     /// See https://www.lua.org/manual/5.1/manual.html#lua_getallocf

src/zigluau/tests.zig

@@ -421,9 +421,12 @@ test "garbage collector" {
     lua.gcCollect();
     lua.gcRestart();
     lua.gcStep();
+    _ = lua.gcIsRunning();
     _ = lua.gcCount();
     _ = lua.gcCountB();
+    _ = lua.gcSetGoal(10);
     _ = lua.gcSetStepMul(2);
+    _ = lua.gcSetStepSize(1);
 }
 
 test "table access" {