Updates to @actions/artifact package (#367)

* GZip implementation

* Optimizations and cleanup

* Update tests

* More test updates

* Update packages/artifact/src/internal-utils.ts

Co-Authored-By: Josh Gross <joshmgross@github.com>

* Clarification around Upload Paths

* Refactor to make http clients classes

* GZip fixes

* Documentation around compression

* More detailed status information during large uploads

* Pretty format

* Percentage updates without rounding

* Fix edge cases with formatting numbers

* Update packages/artifact/src/internal-utils.ts

Co-Authored-By: Josh Gross <joshmgross@github.com>

* Cleanup

* Small reorg with status reporter

* PR Feedback

* Cleanup + Simplification

* Test Cleanup

* Mock updates

* More cleanup

* Format fixes

* Overhaul to the http-manager

* Fix tests

* Promisify stats

* Documentation around implementation

* Improvements to documentation

* PR Feedback

* Remove Downloading multiple artifacts concurrently

Co-authored-by: Josh Gross <joshmgross@github.com>

packages/artifact/package.json

@@ -37,6 +37,9 @@
   },
   "dependencies": {
     "@actions/core": "^1.2.1",
-    "@actions/http-client": "^1.0.6"
+    "@actions/http-client": "^1.0.6",
+    "@types/tmp": "^0.1.0",
+    "tmp": "^0.1.0",
+    "tmp-promise": "^2.0.2"
   }
 }