Allow JWT authorization options to support multiple issuers

[theJC]

Is your feature request related to a problem? Please describe.

JWT authorization issuer config only supports a single string, we have environments where we require to support 2 issuers

Describe the solution you'd like

Change JWT authorization to support a list of issuers that are supported

Describe alternatives you've considered

No alternatives that I can think of

Additional context

N/A

[theJC]

We are migrating from Gateway with our code to support OAuth tokens, and for several of our environments we need to support multiple issuers.

In Gateway, we were using this de-facto standard library: https://github.com/auth0/node-jsonwebtoken which supported this capability out of the box:

issuer (optional): string or array of strings of valid values for the iss field.