Fix/xread offset

[tomaszym]

Addresses #460 and maybe #445

I guess lettuce api evolved into into using objects and not a string as params and integration broke

The hard thing here would be to choose sane defaults – instead I've exposed the params which is a good thing anyway IMHO.

In the future this will need research and documentation because if I understood the docs correctly:

• passing block 0 in redis blocks indefinitely (Duration.Zero or Duration.Inf or both 😆 ?)
• I did not test/research what lettuce actually does when 0 passed

but for now I think it's better to patch it like this rather than wait

Links:

• https://redis.io/commands/xread
• block 0 in jedis xread with block=0 doesn't block redis/jedis#2277

[gvolpe]

Thanks! I'm definitely not familiar with this API but if it fixes the current issue I think it's already better :)

Any chances you can make a similar PR against the series/1.x branch? I don't think this can be cherry-picked because the code will be a bit different.

[gvolpe]

Sorry this stayed open for so long, should've been merged long ago. If someone wants to pick up the work for the CE3 version, the issues will remain open.