Update other packages to use http-client v2 (#1082)

We moved `@actions/http-client` to be part of the toolkit in https://github.com/actions/toolkit/pull/1062.  We also made some breaking changes to exported types and released v2.

The biggest change in terms of lines of code affected was to get rid of the `I-` prefix for interfaces since TypeScript doesn't follow this convention.

I bumped the patch version of all packages except for `tool-cache`, where I bumped the major version.  The rationale is explained in the release notes for that package.

packages/artifact/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/artifact",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "preview": true,
   "description": "Actions artifact lib",
   "keywords": [
@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "@actions/core": "^1.2.6",
-    "@actions/http-client": "^1.0.11",
+    "@actions/http-client": "^2.0.0",
     "tmp": "^0.2.1",
     "tmp-promise": "^3.0.2"
   },