Migrate to Manifest V3

[morkonda]

Chrome will soon require extensions to use the V3 extensions APIs. This will require migrating the code from V2.

• Although this extension doesn't need blocking requests, some newer APIs might be better instead of using webRequest

Initial V3 manifest version to get started:

{
  "name": "SSO privacy extension",
  "description": "A privacy extension that shows data requested with SSO logins.",
  "version": "1.0",
  "manifest_version": 3,
  "background": {
    "service_worker": "src/js/background.js"
  },
  "action": {
    "default_popup": "src/popup.html#popup"
  },
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "permissions": [
    "webRequest"
  ],
  "content_scripts": [
      {
        "matches": [
          "http://*/*",
          "https://*/*"
        ],
        "css": ["src/css/permissions.css"],
        "js": [
          "src/js/identity-providers.js",
          "src/js/permissions.js",
          "src/js/contentscript.js"
        ],
        "run_at": "document_idle"
      }
  ]
}