build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/types/event-metadata.ts

@@ -0,0 +1,23 @@
+import {
+  EventMetadataCategories,
+  EventMetadataKeyType,
+  EventMetadataType,
+} from "./enums";
+
+export interface IEventMetadata {
+  key: string;
+  title?: string;
+  value: string;
+  type: EventMetadataType;
+}
+
+export interface IEventMetadataDescription extends IEventMetadata {
+  icon?: string;
+  placeholder?: string;
+  description?: string;
+  choices?: Record<string, string>;
+  keyType?: EventMetadataKeyType;
+  pattern?: RegExp;
+  label: string;
+  category: EventMetadataCategories;
+}