permission-node: refactor and split createPermissionIntegration

This refactor makes the createPermissionIntegration system much more
flexible by splitting it up into a few different helpers with different
responsibilities. This frees up plugin authors to connect together the
different parts of the permission integration in whatever way is
convenient for them, and makes the process of registering additional
permission rules a bit more explicit, by requiring them to be passed
in when constructing the systems for transforming or applying
conditions.

Signed-off-by: Mike Lewis <mtlewis@users.noreply.github.com>
Co-authored-by: Joon Park <joonp@spotify.com>
Co-authored-by: Tim Hansen <timbonicus@gmail.com>

plugins/permission-node/package.json

@@ -8,7 +8,6 @@
   "publishConfig": {
     "access": "public",
     "main": "dist/index.cjs.js",
-    "module": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
   "homepage": "https://backstage.io",
@@ -32,7 +31,7 @@
   "dependencies": {
     "@backstage/plugin-auth-backend": "^0.4.6",
     "@backstage/plugin-permission-common": "^0.1.0",
-    "@types/express": "*",
+    "@types/express": "^4.17.6",
     "express": "^4.17.1",
     "zod": "^3.11.6"
   },