chore: use public protos (#7)

* change synth.py to use public protos

* minor docs changes

* generate README.md from .repo-metadata.json

* feat: add deleteAnnotatedDataset to DataLabelingService

* no system/samples tests yet

* fix dead links on ISODateTimeFormat

Author: jkwlui

datalabeling/test/no-test.js

@@ -0,0 +1 @@
+console.log('no test yet');