Support JUSTID flag of XCLAIM command

[christophstrobl]

Feature Request

The JUSTID flags allows to obtain the message id from the PEL without increasing the retry counter.

Is your feature request related to a problem? Please describe

Cannot use XCLAIM with JUSTID.

Describe the solution you'd like

RedisFuture<List<String>> xClaimJustId(K key, Consumer<K> consumer, XClaimArgs args, String... messageIds);

Flux<String> xClaimJustId(K key, Consumer<K> consumer, XClaimArgs args, String... messageIds);

Describe alternatives you've considered

Add justid to XClaimArgs and allow to use it with the existing methods so that it returns StreamMessage with an empty body.

[mp911de]

That's fixed now. Calling XCLAIM with JUSTID returns StreamMessage objects whose body is null