Offchain prototype WIP - do not merge

[CAPtheorem]

[codecov-commenter]

Codecov Report

Merging #350 (0908121) into develop (859f2fb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #350   +/-   ##
========================================
  Coverage    76.09%   76.09%           
========================================
  Files           81       81           
  Lines         3037     3037           
  Branches       469      469           
========================================
  Hits          2311     2311           
  Misses         726      726           

Flag	Coverage Δ
batch-submitter	59.51% <ø> (ø)
contracts	86.05% <ø> (ø)
core-utils	68.16% <ø> (ø)
data-transport-layer	37.68% <ø> (ø)
message-relayer	72.22% <ø> (ø)

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