LNP/BP identity protocols implementation

[dr-orlovsky]

This does not include RGB identity-related things, which are the layer on top of LNP/BP identity

[codecov]

Codecov Report

Base: 68.5% // Head: 66.1% // Decreases project coverage by -2.4% ⚠️

Coverage data is based on head (3912699) compared to base (030d8ab).
Patch coverage: 43.3% of modified lines in pull request are covered.

❗ Current head 3912699 differs from pull request most recent head 3090f85. Consider uploading reports for the commit 3090f85 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #223     +/-   ##
========================================
- Coverage    68.5%   66.1%   -2.4%     
========================================
  Files           5       6      +1     
  Lines        1341    1799    +458     
========================================
+ Hits          919    1189    +270     
- Misses        422     610    +188     

Impacted Files	Coverage Δ
src/bin/lnpbp.rs	0.5% <0.0%> (-0.6%)	⬇️
src/lib.rs	57.4% <ø> (+18.0%)	⬆️
identity/src/lib.rs	66.5% <66.5%> (ø)

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