additional use cases of replication tests

[heckj]

refined to what SHOULD be after re-reading algorithms and intents - initial commit includes failing tests

resolves #13

[codecov-commenter]

Codecov Report

Merging #20 (086943e) into main (877fc5e) will decrease coverage by 0.40%. The diff coverage is 97.26%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   97.56%   97.15%   -0.41%     
==========================================
  Files          16       16              
  Lines        1189     1301     +112     
==========================================
+ Hits         1160     1264     +104     
- Misses         29       37       +8     

Impacted Files	Coverage Δ
Tests/CRDTTests/ORSetTests.swift	97.76% <96.93%> (-1.21%)	:arrow_down:
Tests/CRDTTests/ORMapTests.swift	97.79% <96.96%> (-1.27%)	:arrow_down:
Sources/CRDT/ORMap.swift	85.12% <100.00%> (-1.24%)	:arrow_down:
Sources/CRDT/ORSet.swift	99.22% <100.00%> (-0.06%)	:arrow_down:

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