Use new DBC method APIs

[dr-orlovsky]

Applies BP-WG/bp-core#105 to this library

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.6%. Comparing base (95b8b89) to head (2404da4).

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #50   +/-   ##
======================================
  Coverage    42.6%   42.6%           
======================================
  Files          24      24           
  Lines        4235    4235           
======================================
  Hits         1804    1804           
  Misses       2431    2431           

Flag	Coverage Δ
rust	42.6% <ø> (ø)

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