Add @hexagon/base64 dependency

This supports encoding/decoding strings into ArrayBuffers across different platforms. Currently node requires the Buffer instance and browsers only have the very legacy `atob` and `btoa` functions that use Latin-1 encodings.

Author: aron

package-lock.json

@@ -45,5 +45,8 @@
     "publint": "^0.2.7",
     "ts-jest": "^29.1.0",
     "typescript": "^5.0.2"
+  },
+  "dependencies": {
+    "@hexagon/base64": "^1.1.28"
   }
 }