Add metadata GV loader api (#84)

* Add metadata GV loader api

* Register commands

* fix lint + docs issue

theseus_gui/src/helpers/metadata.js

@@ -0,0 +1,19 @@
+import { invoke } from '@tauri-apps/api/tauri'
+
+/// Gets the game versions from daedalus
+// Returns a VersionManifest
+export async function get_game_versions() {
+  return await invoke('metadata_get_game_versions')
+}
+
+// Gets the fabric versions from daedalus
+// Returns Manifest
+export async function get_fabric_versions() {
+  return await invoke('metadata_get_fabric_versions')
+}
+
+// Gets the forge versions from daedalus
+// Returns Manifest
+export async function get_forge_versions() {
+  return await invoke('metadata_get_forge_versions')
+}