RequireIssuer checks multiple issuers

[oussamaachech]

It would be nice if the JwtParserBuilder requireIssuer can accept an array of issuer Strings in order to check if the 'iss' from the parsed jwt token matches one of these issuers.

[lhazlewood]

This should be completed as part of #336

[stale]

This issue has been automatically marked as stale due to inactivity for 60 or more days. It will be closed in 7 days if no further activity occurs.

[stale]

Closed due to inactivity.

[ars-java]

Is anybody implementing it? If not I can take this issue.

[lhazlewood]

Reopening. However, we're introducing a new validation framework for 1.0, so the implementation of this will be dependent upon that, so please no pull requests for this feature just yet - until that is finished.

[stale]

This issue has been automatically marked as stale due to inactivity for 60 or more days. It will be closed in 7 days if no further activity occurs.

[lhazlewood]

Closing this in favor of #474 . The require* methods were too numerous and didn't do nearly enough, but #474 will allow an entire range of validations.