Disclosure implementation: closes #13

[dr-orlovsky]

No description provided.

[rajarshimaitra]

Concept ACK.

Suggestion: I couldn't find the purpose of this structure written anywhere. It would be better to have the purpose of the Disclosure documented here in this PR or somewhere else, as it will guide the implementation and future reviews.

What I mean is,

1. documenting the transitions and extensions fields inside Disclosure and explain why and which data from stash are to be included here to create a Disclosure.

2. Use of Disclosure in general, and how it is related to Transfering from multi-asset outputs: closes #143 rgb-node#148

The best approach would be to include them inside the code doc itself. So future developers can reason with the structure.

This is just a TODO. We can do this after the finalization of the implementations.

[codecov]

Codecov Report

Merging #26 (61cd091) into master (df9b4d6) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #26   +/-   ##
======================================
  Coverage    21.9%   21.9%           
======================================
  Files          20      20           
  Lines        1153    1153           
======================================
  Hits          252     252           
  Misses        901     901           

Impacted Files	Coverage Δ
src/bech32.rs	100.0% <ø> (ø)
src/lib.rs	50.0% <ø> (ø)

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