feat(world-module-metadata): add metadata system lib (#3645)

Author: frolic

.changeset/six-taxis-crash.md

@@ -0,0 +1,11 @@
+---
+"@latticexyz/world-module-metadata": patch
+---
+
+Added experimental system library for metadata system. Note that this is marked experimental as we may make breaking changes to the interface.
+
+```solidity
+import { metadataSystem } from "@latticexyz/world-metadata-module/src/codegen/experimental/systems/MetadataSystemLib.sol";
+
+metadataSystem.setResourceTag(namespaceId, bytes32("label"), "hello");
+```

packages/world-module-metadata/mud.config.ts

@@ -2,6 +2,11 @@ import { defineWorld } from "@latticexyz/world";
 
 export default defineWorld({
   namespace: "metadata",
+  codegen: {
+    generateSystemLibraries: true,
+    // generate into experimental dir until these are stable/audited
+    systemLibrariesDirectory: "experimental/systems",
+  },
   userTypes: {
     ResourceId: { filePath: "@latticexyz/store/src/ResourceId.sol", type: "bytes32" },
   },

packages/world-module-metadata/src/codegen/experimental/systems/MetadataSystemLib.sol

@@ -121,6 +121,7 @@ export const systemsConfig = defineWorld({
     worldgenDirectory: "interfaces",
     worldInterfaceName: "IBaseWorld",
     generateSystemLibraries: true,
+    // generate into experimental dir until these are stable/audited
     systemLibrariesDirectory: "experimental/systems",
   },
   // Keep aligned with src/modules/init/constants.sol