[BUG] FCM claims to support Symbol for credentials

[bvogel]

Bug Report

Describe the Bug:
FCM does not support configurations through symbols any more.

To Reproduce:

    deliver_by :fcm do |config|
      config.credentials = :firebase_credentials
      config.device_tokens = :fcm_device_tokens
      config.json = :firebase_notification
    end

should work, but results in ArgumentError: FCM credentials must be a Hash, String, Pathname, or Symbol as 47b032d8f2a7d7e677d4bea removed symbol support.

Expected Behavior:
Symbols should work or error and documentation should reflect the cuent state.

Actual Behavior:
ArgumentError: FCM credentials must be a Hash, String, Pathname, or Symbol

Environment:

• Noticed gem version: 2.2.2
• Ruby version: 3.3.4
• Rails version: 7.1.3.4
• Operating System: docker

Possible Fix:
add this back in:

          when Symbol
            notification.send(option)

Checklist:

• I have searched for similar issues and couldn't find any
• I have checked the documentation for relevant information
• I have included all the required information

[excid3]

evaluate_option is what handles the Symbol, so it works as expected.

The return value of your function needs to return a hash of credentials, or a path to the credentials file.

[bvogel]

ok, for anyone else running into this: make sure the method defined by the symbol is public