Store custom offset

[MarcialRosales]

Up until now we could only commit the last delivered message in case of manual offset tracking and automatically, after N messages or after N unit of time.

However, there are scenarios where we need to commit a given offset, not necessarily the very last delivered offset. This is specially necessary when we process messages in the background, outside of the message handler method.

[Gsantomaggio]

Can you please add the documentation on the REAME.md file about that?

[MarcialRosales]

Can you please add the documentation on the REAME.md file about that?

Absolutely. But I think I will also add an example as we do with other features. Thanks!

[Gsantomaggio]

But I think I will also add an example as we do with other features.

Great :)!

[codecov-commenter]

Codecov Report

Merging #125 (8c860f2) into main (d8131c3) will increase coverage by 0.53%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   79.82%   80.36%   +0.53%     
==========================================
  Files          16       16              
  Lines        2493     2500       +7     
==========================================
+ Hits         1990     2009      +19     
+ Misses        367      355      -12     
  Partials      136      136              

Impacted Files	Coverage Δ
pkg/stream/consumer.go	77.38% <93.33%> (+0.30%)	⬆️
pkg/stream/server_frame.go	83.59% <0.00%> (+1.54%)	⬆️
pkg/stream/client.go	83.60% <0.00%> (+1.59%)	⬆️

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