feat: updated the Metadata type to allow for custom properties (#975)

## This PR
- Updates the `Metadata` type to a `Record` so that Providers can
provide more than just the `name` property as part of the `metadata`.

### Notes
Conversation
[here](https://cloud-native.slack.com/archives/C03J36ZP020/p1721747906370629).

---------

Signed-off-by: Juan Bernal <juanxwtf@gmail.com>

package-lock.json

@@ -13851,7 +13851,7 @@
     },
     "packages/client": {
       "name": "@openfeature/web-sdk",
-      "version": "1.2.0",
+      "version": "1.2.1",
       "license": "Apache-2.0",
       "devDependencies": {
         "@openfeature/core": "1.3.0"
@@ -13883,7 +13883,7 @@
     },
     "packages/react": {
       "name": "@openfeature/react-sdk",
-      "version": "0.4.1",
+      "version": "0.4.2",
       "license": "Apache-2.0",
       "devDependencies": {
         "@openfeature/core": "*",

packages/shared/src/client/client.ts

@@ -1,7 +1,6 @@
-import { Metadata } from '../types';
 import { ProviderMetadata } from '../provider/provider';
 
-export interface ClientMetadata extends Metadata {
+export interface ClientMetadata {
   /**
    * @deprecated alias of "domain", use domain instead
    */

packages/shared/src/provider/provider.ts

@@ -82,7 +82,7 @@ export { ClientProviderStatus as AllProviderStatus };
 /**
  * Static data about the provider.
  */
-export interface ProviderMetadata extends Metadata {
+export interface ProviderMetadata extends Readonly<Metadata> {
   readonly name: string;
 }
 

packages/shared/src/types/metadata.ts

@@ -1,2 +1 @@
-// eslint-disable-next-line @typescript-eslint/no-empty-interface
-export interface Metadata {}
+export type Metadata = Record<string, string>;