Release support for cross-os caching as opt-in feature (#1060)

* Release support for cross-os caching as opt-in feature
Add documentation for cross-os caching

* Apply suggestions from code review

Co-authored-by: Lovepreet Singh <pdotl@github.com>

* Address review comments

Co-authored-by: Lovepreet Singh <pdotl@github.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cache",
-  "version": "3.2.2",
+  "version": "3.2.3",
   "private": true,
   "description": "Cache dependencies and build outputs",
   "main": "dist/restore/index.js",