Enhancement: support ESPHome widget authentication (#3846)

* Added cookie support for auth on ESPHome widget

* Lint

* Use credentialedProxyHandler instead

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/widgets/services/esphome.md

@@ -16,4 +16,5 @@ To group both `offline` and `unknown` devices together, users should use the `of
 widget:
   type: esphome
   url: http://esphome.host.or.ip:port
+  key: myesphomecookie # only if auth enabled, get the value from a request from the frontend e.g. `authenticated=myesphomecookie`
 ```