Added support for Reader in blob store.

tests/fileservice_test.ts

@@ -76,6 +76,14 @@ Deno.test("DenoKVBlobService happy path", async (t) => {
     assertEquals(await bs.getNumberOfBlobs("0001"), 21);
   });
 
+  await t.step("read write large file", async () => {
+    const f = await Deno.open('tests/examples/teapot.obj');
+    await bs.persistReader("large-stream", f);
+   
+    assertEquals(await bs.getNumberOfBlobs("large-stream"), 1030);
+    f.close();
+  });
+
   kv.close();
 });