[FEAT]: Allow forwarding / Backend / Process token from forwarded emails

[lnovitz]

Is there an existing request for this feature?

• I have searched the existing issues

Is there a pain point in the app driving this feature request?

• App is limited to 100 users due to Gmail API security verification requirements
• Anyone who does not use a gmail account for job applications (e.g. students with outlook emails, yahoo, hotmail) is excluded from being able to use the app

Desired Behavior

Anyone, regardless of email client, can set up email forwarding and see their job application data in our app

Criteria for Completion

• When processing incoming emails
  • Extract both userId and token from the plus address
  • Verify the token matches what's stored for that userId
  • Reject emails with invalid tokens

Anything else?

Starter code - feel free to create new branch based off of this: #333

Related to #240, but can work independently

Code of Conduct

• I've read the Code of Conduct and understand my responsibilities as a member of the jobba.help Community

[github-actions]

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