updater_sample: Add streaming to PayloadSpec

PayloadSpec
- add streaming generator and tests
- fix sample.json
- fix tests
- rename PackagePropertyFiles to PackageFiles, it has info
  not only about property files, and new name is shorter

Bug: 77148467
Test: `mmma -j bootable/recovery/updater_sample`
Change-Id: I9c1206c07c37183f13d3c25940f12981ca85b1b4
Signed-off-by: Zhomart Mukhamejanov <zhomart@google.com>
diff --git a/updater_sample/tests/src/com/example/android/systemupdatersample/util/FileDownloaderTest.java b/updater_sample/tests/src/com/example/android/systemupdatersample/util/FileDownloaderTest.java
index df47c8c..dc7ec09 100644
--- a/updater_sample/tests/src/com/example/android/systemupdatersample/util/FileDownloaderTest.java
+++ b/updater_sample/tests/src/com/example/android/systemupdatersample/util/FileDownloaderTest.java
@@ -73,7 +73,7 @@
         FileDownloader downloader = new FileDownloader(url, 160, 8, outFile);
         downloader.download();
         String downloadedContent = String.join("\n", Files.readAllLines(outFile.toPath()));
-        // Look at tools/create_test_ota.py
+        // archive contains text files with uppercase filenames
         assertEquals("CARE_MAP", downloadedContent);
     }