chore: improve reprovider with batch queue reads

[gammazero]

Improve reprovider queue efficiency by attempting a batch read whenever more data is available.

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.56%. Comparing base (a88ea29) to head (4e79204).

Files with missing lines	Patch %	Lines
provider/reprovider.go	41.66%	5 Missing and 2 partials ⚠️

@@            Coverage Diff             @@
##             main    #1173      +/-   ##
==========================================
- Coverage   63.58%   63.56%   -0.02%     
==========================================
  Files         268      268              
  Lines       26964    26972       +8     
==========================================
+ Hits        17144    17145       +1     
- Misses       8102     8110       +8     
+ Partials     1718     1717       -1     

Files with missing lines	Coverage Δ
provider/reprovider.go	57.74% <41.66%> (-0.59%)	⬇️

... and 11 files with indirect coverage changes

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[guillaumemichel]

Is this intentional that this is the same number as dsqueue dedup cache size?

boxo/provider/reprovider.go

Line 149 in 4e79204

s.q = dsqueue.New(s.ds, "provide", dsqueue.WithDedupCacheSize(2048))

If yes, we might as well define a global const used at both places.