Support validate multiple issuers

[hangzhang-circle]

Checklist

• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

Is there a plan to support multiple issuers validation?

Describe the ideal solution

Hi team,
Similar to this request in Java Library - auth0/java-jwt#246
That today the Java library supports a list of issuers - https://github.com/auth0/java-jwt/blob/master/lib/src/main/java/com/auth0/jwt/interfaces/Verification.java#L34

Do we have a plan to implement this feature in Go library? The scenario is very common while using Auth0's Step-up authentication. While the regular JWT is issued from our custom domain (say issuer-url) and Auth0's Step-up authentication JWT is issued from issuer-url.auth0.us.com.

Today i have to setup 2 validators for those 2 issuers, would be great if we can make issuer verification support a list of audience.

Alternatives and current workarounds

No response

Additional context

No response

[ewanharris]

Hey @hangzhang-circle 👋

I think if this is supported in our other libraries then we would support here also too, I don't have any timelines on when we might add this but we would review a PR if you were interested.