[CORL-498, CORL-495, CORL-539, CORL-496, CORL-494] Email Notifications Support & Framework (#2498)

* chore: renamed old templates

* feat: initial notifications support

* feat: email enhancements

* fix: linting

* feat: initial digesting beheviour

* feat: added notification configuration

* feat: added unsubscribe routes

* fix: fixed failing snapshots/tests bc random ids

* feat: adjusted the save beheviour, added tests

* feat: added tests

* feat: added staff replies

* feat: renamed E-Mail to Email

* feat: enhanced cron processing

* fix: linting + updating tests

* feat: enhanced cron context

* fix: added staff replies back in

package-lock.json

@@ -4047,6 +4047,12 @@
         "@types/node": "*"
       }
     },
+    "@types/object-diff": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/@types/object-diff/-/object-diff-0.0.0.tgz",
+      "integrity": "sha1-yecnRxRvOiNxTqPj29agJ9mRHaY=",
+      "dev": true
+    },
     "@types/on-finished": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/@types/on-finished/-/on-finished-2.3.1.tgz",
@@ -23430,6 +23436,12 @@
         }
       }
     },
+    "object-diff": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/object-diff/-/object-diff-0.0.4.tgz",
+      "integrity": "sha1-2IOwRE/o/W4E5ZXXu2ZWgskWBH8=",
+      "dev": true
+    },
     "object-inspect": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.6.0.tgz",
@@ -24234,7 +24246,7 @@
       "dependencies": {
         "async": {
           "version": "1.5.2",
-          "resolved": "http://registry.npmjs.org/async/-/async-1.5.2.tgz",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
           "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
           "dev": true
         }