Lastconsumed when no offset

[MarcialRosales]

When we susbcribe to a stream for the first time with a named consumer and with LastConsumed offset, we get the error "19 No Offset" from the broker.

We should not throw the error but instead default lastOffset to 0.

[codecov-commenter]

Codecov Report

Merging #122 (d1ddf2e) into main (0b47773) will increase coverage by 0.28%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   79.70%   79.98%   +0.28%     
==========================================
  Files          16       16              
  Lines        2488     2488              
==========================================
+ Hits         1983     1990       +7     
+ Misses        367      359       -8     
- Partials      138      139       +1     

Impacted Files	Coverage Δ
pkg/stream/constants.go	65.57% <0.00%> (-2.23%)	⬇️
pkg/stream/client.go	81.74% <50.00%> (+1.78%)	⬆️

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