[Feature] Add Auth Token Pre-Fetch routine

[SoundsSerious]

Configure a pre-fetch routine to a separate URL that will apply a token to a rule or a group.

A specific Example: I would like to see JWT Token Fetch setting Authorization Header

[sylingd]

Hello, I plan to implement a feature called "task", this feature is under development, you can check if it meets your needs.

docs: https://dev.header-editor-home.pages.dev/en-US/guide/task.html