Initial Eudico ordering interface

[dnkolegov]

This PR is a work in progress implementation of this interface - https://hackmd.io/6v00B72USpav6rDUUhqxAw

[codecov-commenter]

Codecov Report

Merging #202 (4698b5e) into eudico (3d58d2d) will increase coverage by 0.43%.
The diff coverage is 70.84%.

@@            Coverage Diff             @@
##           eudico     #202      +/-   ##
==========================================
+ Coverage   22.14%   22.57%   +0.43%     
==========================================
  Files         600      600              
  Lines       65606    65635      +29     
==========================================
+ Hits        14528    14817     +289     
+ Misses      48427    48135     -292     
- Partials     2651     2683      +32     

Impacted Files	Coverage Δ
api/api_full.go	0.00% <ø> (ø)
api/v0api/full.go	0.00% <ø> (ø)
build/params_2k.go	84.37% <ø> (ø)
chain/consensus/common/types.go	0.00% <ø> (-100.00%)	⬇️
chain/consensus/mir/consensus.go	33.07% <0.00%> (ø)
node/hello/hello.go	63.63% <ø> (+39.39%)	⬆️
itests/kit/tools_eudico.go	53.71% <40.00%> (ø)
node/impl/full/sync.go	23.89% <40.00%> (+8.23%)	⬆️
itests/kit/ensemble_eudico.go	62.62% <70.83%> (+5.80%)	⬆️
chain/consensus/mir/manager.go	74.26% <74.26%> (ø)
... and 36 more