fix: allow null value in lua_resume

Author: mworzala

src/main/java/net/hollowcube/luau/LuaState.java

@@ -201,7 +201,7 @@ Set Functions (Stack -> Lua)
 
     int yield(int resultCount);
     int break_();
-    @NotNull LuaStatus resume(@NotNull LuaState from, int argCount);
+    @NotNull LuaStatus resume(@Nullable LuaState from, int argCount);
     @NotNull LuaStatus resumeError(@NotNull LuaState from);
     @NotNull LuaStatus status();
     boolean isYieldable();

src/main/java/net/hollowcube/luau/LuaStateImpl.java

@@ -675,8 +675,9 @@ public int break_() {
     }
 
     @Override
-    public @NotNull LuaStatus resume(@NotNull LuaState from, int argCount) {
-        final int status = lua_resume(L, ((LuaStateImpl) from).L, argCount);
+    public @NotNull LuaStatus resume(@Nullable LuaState from, int argCount) {
+        final MemorySegment fromL = from != null ? ((LuaStateImpl) from).L : MemorySegment.NULL;
+        final int status = lua_resume(L, fromL, argCount);
         return LuaStatus.byId(status);
     }