[js/webgpu] Log the key and program info for artifact (microsoft#18365)

With uniform support, ideally we may just keep one artifact for each
program to save the compilation time. This PR just logs the related
info, including key and program name, so that we may understand better
the situation.

js/web/lib/wasm/jsep/backend-webgpu.ts

@@ -413,6 +413,7 @@ export class WebGpuBackend {
     if (!artifact) {
       artifact = this.programManager.build(program, normalizedDispatchGroup);
       this.programManager.setArtifact(key, artifact);
+      LOG_DEBUG('info', () => `[artifact] key: ${key}, programName: ${program.name}`);
     }
 
     LOG_DEBUG(