Nostr dm notifications (#3473)

* Add nostr DM notification provider

* require crypto for node 18 compatibility

* remove whitespace

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* move closer to where it is used

* simplify success or failure logic

* don't clobber the non-alert msg

* Update server/notification-providers/nostr.js

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* polyfills required for node <= 18

* resolve linter warnings

* missing comma

* better websocket polyfill, update deprecated function

* add conditional polyfills for node versions

* lint

* use correct npm for package-lock

---------

Co-authored-by: Frank Elsinga <frank@elsinga.de>
Co-authored-by: Louis Lam <louislam@users.noreply.github.com>

package.json

@@ -100,6 +100,7 @@
         "http-proxy-agent": "~5.0.0",
         "https-proxy-agent": "~5.0.1",
         "iconv-lite": "~0.6.3",
+        "isomorphic-ws": "^5.0.0",
         "jsesc": "~3.0.2",
         "jsonata": "^2.0.3",
         "jsonwebtoken": "~9.0.0",
@@ -115,6 +116,7 @@
         "node-cloudflared-tunnel": "~1.0.9",
         "node-radius-client": "~1.0.0",
         "nodemailer": "~6.6.5",
+        "nostr-tools": "^1.13.1",
         "notp": "~2.0.3",
         "password-hash": "~1.2.2",
         "pg": "~8.8.0",
@@ -132,7 +134,8 @@
         "socks-proxy-agent": "6.1.1",
         "tar": "~6.1.11",
         "tcp-ping": "~0.1.1",
-        "thirty-two": "~1.0.2"
+        "thirty-two": "~1.0.2",
+        "ws": "^8.13.0"
     },
     "devDependencies": {
         "@actions/github": "~5.0.1",