First sync depth option for dagsync.Subscriber

[gammazero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (e98f3fd) 60.66% compared to head (9c47ff5) 60.51%.

Files	Patch %	Lines
dagsync/option.go	0.00%	7 Missing ⚠️
dagsync/subscriber.go	54.54%	3 Missing and 2 partials ⚠️

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Additional details and impacted files

@@                Coverage Diff                 @@
##           release-v0.5.x     #151      +/-   ##
==================================================
- Coverage           60.66%   60.51%   -0.16%     
==================================================
  Files                  57       57              
  Lines                4993     5009      +16     
==================================================
+ Hits                 3029     3031       +2     
- Misses               1637     1649      +12     
- Partials              327      329       +2     

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