Retry all http calls for artifact upload and download (#675)

* Retry all http calls for artifact upload and download

* Extra debug information

* Fix lint

* Always read response body

* PR Feedback

* Change error message if patch call fails

* Add exponential backoff when retrying

* Rework tests and add diagnostic info if exception thrown

* Fix lint

* fix lint error for real this time

* PR cleanup

* 0.5.0 @actions/artifact release

* Display diagnostic info if non-retryable code is hit

RELEASES.md

@@ -50,3 +50,7 @@
 
 - Improved retry-ability when a partial artifact download is encountered
 
+### 0.5.0
+
+- Improved retry-ability for all http calls during artifact upload and download if an error is encountered
+