Implement hit condition breakpoint

[karthiknadig]

#14
#342

[codecov-io]

Codecov Report

Merging #359 into master will decrease coverage by 0.16%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   58.18%   58.01%   -0.17%     
==========================================
  Files          17       17              
  Lines        2597     2613      +16     
==========================================
+ Hits         1511     1516       +5     
- Misses       1086     1097      +11

Impacted Files	Coverage Δ
ptvsd/wrapper.py	48.11% <16.66%> (-0.56%)	⬇️
ptvsd/runner.py	26.76% <50%> (ø)	⬆️
ptvsd/ipcjson.py	67% <0%> (+1.5%)	⬆️

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