Limit number of goroutines in FastCommit()

[SaveTheRbtz]

Partially improves: #267

Description

Currently, PersistentSlabStorage.FastCommit() creates goroutines during runtime.

This may be a bit inefficient in cases where there is a small number of keys and a high number of CPUs. For now, simply upper-bound the number of goroutines by the number keys.

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• [x] Targeted PR against main branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [x] Code follows the standards mentioned here
• [x] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #268 (f439666) into main (525fbc2) will decrease coverage by 0.02%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   68.98%   68.95%   -0.03%     
==========================================
  Files          14       14              
  Lines        7257     7260       +3     
==========================================
  Hits         5006     5006              
- Misses       1619     1621       +2     
- Partials      632      633       +1     

Impacted Files	Coverage Δ
storage.go	79.13% <0.00%> (-0.42%)	:arrow_down:

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