feat: Add spawner util

+ Added spawner utility

+ Bumped to v0.1.4

lib/spawner.luau

@@ -0,0 +1,49 @@
+--!strict
+local spawner_type = require("./spawner_type")
+local WORLD = require("./world").get
+local handle = require("./handle")
+
+export type spawner<T...> = spawner_type.spawner<T...>
+
+--- Creates an entity spawner.
+--- ```luau
+--- local spawner = jecs_utils.spawner(components.part, components.velocity, components.position)
+--- for _ = 1, 1000 do
+---     spawner.spawn(part_template:Clone(), Vector3.zero, Vector3.zero)
+--- end
+--- ```
+--- @param ... T... -- Components to use.
+--- @return spawner<T...>
+local function spawner(...)
+    local components = { ... }
+    local world = WORLD()
+
+    local function spawn(...)
+        local passed = { ... }
+        local entity = world:entity()
+
+        for idx, component in components do
+            world:set(entity, component, passed[idx])
+        end
+
+        return entity
+    end
+
+    local function spawn_with_handle(...)
+        local passed = { ... }
+        local entity = handle(world:entity())
+
+        for idx, component in components do
+            entity:set(component, passed[idx])
+        end
+
+        return entity
+    end
+
+    return {
+        spawn = spawn,
+        spawn_with_handle = spawn_with_handle,
+    }
+end
+
+return (spawner :: any) :: spawner_type.create_spawner