Retrieval of Jwk token is blocking

[huntc]

This could also be viewed as a feature request, but I think it is more of a bug given that I've later discovered the following line of JwkProvider to be a blocking call:

    Jwk get(String keyId) throws JwkException;

Should we not return a future instead?

[poovamraj]

Hi @huntc, I guess we could have added this to the documentation to ensure it was conveyed properly that it is a blocking call. Returning to the future would be ideal. It would be great if you can provide a PR for this, we could help you with it if needed.

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[jimmyjames]

I agree with @poovamraj we should at least update the documentation to ensure its clear. And if we can add async support in a nice way, that's something we can consider.