rewrite artifacts client to have public and internal implementations

packages/artifact/src/internal/shared/interfaces.ts

@@ -120,13 +120,21 @@ export interface Artifact {
    */
   id: number
 
-  /**
-   * The URL of the artifact
-   */
-  url: string
-
   /**
    * The size of the artifact in bytes
    */
   size: number
 }
+
+// LookupOptions are for fetching Artifact(s) out of the scope of the current run.
+// Must specify a PAT with actions:read scope for cross run/repo lookup otherwise these will be ignored.
+export interface LookupOptions {
+  // Token with actions:read permissions
+  token: string
+  // WorkflowRun of the artifact(s) to lookup
+  workflowRunId: number
+  // Repository owner
+  repositoryOwner: string
+  // Repository name
+  repositoryName: string
+}