Introduce FanOutOldestId setting for picking last message for fan-out

[sysradium]

Perhaps it makes more sense to allow customisation in fan-out setting?

For example in my case I built a service which has to consume whole stream each time it restarts (it maintains an in-memory read model). I can do that with consumer groups but that does seem to be a good fit for my case

PS. Though it breaks a default behaviour, since by default OldestId is $ :/ I guess the only way out here would a creation of additional configuration parameter ...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.54%. Comparing base (e1e2380) to head (62ea826).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   78.77%   79.54%   +0.76%     
==========================================
  Files           3        3              
  Lines         523      523              
==========================================
+ Hits          412      416       +4     
+ Misses         82       79       -3     
+ Partials       29       28       -1     

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[minghsu0107]

I suggest create an additional config field such as FanOutOldestId to avoid breaking change. Remember to also update the test

Others LGTM

[sysradium]

@minghsu0107 thanks. Introduced setting and added a test.