76 multiple base url for avni

[fatchat]

What

Added a "Base URL" field to the Avni connector setup form

How

Added fields to the manifest.yaml
Referenced the url_base field in CustomAuthenticator to fetch the token from the correct IDP endpoint

🚨 User Impact 🚨

Existing source connectors need to be updated with their relevant Base URLs

[github-actions]

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[siddhant3030]

looks good to me