refactor: parse options with multiple = in cli

There was a case with the hashed-password which had multiple equal signs in the
value and it wasn't being parsed correctly. This uses a new function and adds a
few tests.

test/package.json

@@ -17,7 +17,5 @@
   },
   "resolutions": {
     "@playwright/test/playwright": "^1.11.0-next-alpha-apr-13-2021"
-  },
-  "dependencies": {
   }
 }