Add support for custom Map claim

[gkrizhevsky]

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Describe the problem you'd like to have solved

To make the library useful need to add custom Map claim when creating a new token.

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Describe the ideal solution

The method should be like ".withMapClaim("map", map)":

String token = JWT.create()
.withMapClaim("map", map)
.sign(algorithm);

A clear and concise description of what you want to happen.

Need to be able to add ad-hoc JSON map structure as claim

Alternatives and current work-arounds

Current work-around to use JJWT or possibly hack into the JWT internals with reflection

A clear and concise description of any alternatives you've considered or any work-arounds that are currently in place.

Additional context

Add any other context or screenshots about the feature request here.

[kfud]

Hello, I just ran into the exact same problem... +1 one from me. Actually adding just this one method to the JWTCreator.Builder class does the trick:

    public JWTCreator.Builder withMapClaim(String name, Map<String, Object> items) throws IllegalArgumentException {
        this.assertNonNull(name);
        this.addClaim(name, items);
        return this;
    }

[lbalmaceda]

This is present since the latest release. Check #282 for a hint on the usage