Include chain break points in returned embedding context

[kevinchern]

Example of "chain break points": a chain with +++: no break points. a chain with +--: break point at (0,1) a chain with +-+: break points at (0,1) and (1,2)

[codecov-commenter]

Codecov Report

Merging #447 (8135c08) into master (13bda5c) will decrease coverage by 2.95%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #447      +/-   ##
==========================================
- Coverage   90.52%   87.57%   -2.96%     
==========================================
  Files          22       22              
  Lines        1520     1521       +1     
==========================================
- Hits         1376     1332      -44     
- Misses        144      189      +45     

Impacted Files	Coverage Δ
dwave/system/composites/embedding.py	96.02% <100.00%> (-1.13%)	:arrow_down:
dwave/system/samplers/leap_hybrid_sampler.py	61.42% <0.00%> (-14.29%)	:arrow_down:
dwave/system/samplers/clique.py	77.35% <0.00%> (-5.04%)	:arrow_down:
dwave/system/samplers/dwave_sampler.py	84.14% <0.00%> (-3.05%)	:arrow_down:

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