Second attempt to implement granular reactions

[winitzki]

Implement finer granularity in the reaction scheduler, as an automatic optimization.

Reactions involving independent molecules should be scheduled concurrently whenever enough molecules are present. The reaction scheduler should not lock the entire set of all molecules while looking for molecule values. Instead, it should implement granular subset locking, so that several instances of reaction scheduler could look for their molecule values concurrently, when this does not modify the result of the computation.

[codecov[bot]]

Codecov Report

Merging #124 into master will increase coverage by 0.07%. The diff coverage is 100%.

@@           Coverage Diff            @@
##           master   #124      +/-   ##
========================================
+ Coverage   99.92%   100%   +0.07%     
========================================
  Files          14     14              
  Lines        1259   1249      -10     
  Branches      158    152       -6     
========================================
- Hits         1258   1249       -9     
+ Misses          1      0       -1

Impacted Files	Coverage Δ
core/src/main/scala/io/chymyst/jc/Reaction.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/SmartPool.scala	100% <100%> (ø)	:arrow_up:
...re/src/main/scala/io/chymyst/jc/ReactionSite.scala	100% <100%> (+0.32%)	:arrow_up:
core/src/main/scala/io/chymyst/jc/Core.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/Molecules.scala	100% <100%> (ø)	:arrow_up:

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