[Artifacts] zip creation + blob storage upload functionality (#1488)

* Artifact zip creation + blob storage upload functionality

* Fix lint

* PR feedback

src/internal/shared/config.ts

@@ -1,3 +1,9 @@
+// Used for controlling the highWaterMark value of the zip that is being streamed
+// The same value is used as the chunk size that is use during upload to blob storage
+export function getUploadChunkSize(): number {
+  return 8 * 1024 * 1024 // 8 MB Chunks
+}
+
 export function getRuntimeToken(): string {
   const token = process.env['ACTIONS_RUNTIME_TOKEN']
   if (!token) {