start on DCM write-up

[winitzki]

• [x] a new chapter describing the DCM, with motivation
• [x] example: distributed map/reduce without ordered reduce
• [ ] example: distributed merge-sort
• [ ] example: distributed pipeline
• [ ] example: distributed cache

[codecov[bot]]

Codecov Report

Merging #161 into master will decrease coverage by 5.34%. The diff coverage is 74.9%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage     100%   94.65%   -5.35%     
==========================================
  Files          18       20       +2     
  Lines        1098     1291     +193     
  Branches      144      159      +15     
==========================================
+ Hits         1098     1222     +124     
- Misses          0       69      +69

Impacted Files	Coverage Δ
core/src/main/scala/io/chymyst/jc/Macros.scala	100% <ø> (ø)	:arrow_up:
...re/src/main/scala/io/chymyst/jc/BlockingPool.scala	100% <ø> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/FixedPool.scala	100% <ø> (ø)	:arrow_up:
...rc/main/scala/io/chymyst/jc/EmitterDebugging.scala	100% <100%> (ø)
.../src/main/scala/io/chymyst/jc/StaticAnalysis.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/Reaction.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/MutableBag.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/package.scala	100% <100%> (ø)	:arrow_up:
core/src/main/scala/io/chymyst/jc/Cluster.scala	48% <48%> (ø)
...e/src/main/scala/io/chymyst/jc/ChymystThread.scala	90% <50%> (-10%)	:arrow_down:
... and 6 more

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